feat: warn when sending to address with zero tx history (#82 )

On the confirm-tx screen, asynchronously check the recipient address via Blockscout API. If the address has never sent or received any transactions, display a prominent red warning banner. Closes #82
2026-02-28 14:55:00 -08:00
23 changed files with 699 additions and 859 deletions
--- a/src/popup/index.html
+++ b/src/popup/index.html
@@ -56,105 +56,37 @@
                    &lt; Back
                </button>
                <h2 class="font-bold mb-2">Add Wallet</h2>
-
-                <!-- Mode selector tabs -->
+                <p class="mb-2">
+                    Enter your 12 or 24 word recovery phrase below, or click the
+                    button to roll the die for a new one.
+                </p>
+                <div class="mb-1 flex justify-end">
+                    <button
+                        id="btn-generate-phrase"
+                        class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer text-xs"
+                        title="Generate a random recovery phrase"
+                    >
+                        [&#9856;]
+                    </button>
+                </div>
+                <div class="mb-2">
+                    <textarea
+                        id="wallet-mnemonic"
+                        rows="3"
+                        class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg resize-y"
+                        placeholder="word word word ..."
+                    ></textarea>
+                </div>
                <div
-                    class="flex border-b border-border mb-3"
-                    id="add-wallet-tabs"
+                    id="add-wallet-phrase-warning"
+                    class="text-xs mb-2 border border-border border-dashed p-2 hidden"
                >
-                    <button
-                        id="tab-mnemonic"
-                        class="px-3 py-1.5 cursor-pointer text-xs font-bold border border-border border-b-bg bg-bg -mb-px"
-                    >
-                        From Phrase
-                    </button>
-                    <button
-                        id="tab-privkey"
-                        class="px-3 py-1.5 cursor-pointer text-xs text-muted border border-dashed border-border-light border-b-transparent -mb-px hover:bg-fg hover:text-bg"
-                    >
-                        From Key
-                    </button>
-                    <button
-                        id="tab-xprv"
-                        class="px-3 py-1.5 cursor-pointer text-xs text-muted border border-dashed border-border-light border-b-transparent -mb-px hover:bg-fg hover:text-bg"
-                    >
-                        From xprv
-                    </button>
+                    Write these words down and keep them safe. Anyone with them
+                    can take your funds; if you lose them, your wallet is gone.
                </div>
-
-                <!-- Mnemonic form section -->
-                <div id="add-wallet-section-mnemonic">
-                    <p class="mb-2">
-                        Enter your 12 or 24 word recovery phrase below, or click
-                        the button to roll the die for a new one.
-                    </p>
-                    <div class="mb-1 flex justify-end">
-                        <button
-                            id="btn-generate-phrase"
-                            class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer text-xs"
-                            title="Generate a random recovery phrase"
-                        >
-                            [&#9856;]
-                        </button>
-                    </div>
-                    <div class="mb-2">
-                        <textarea
-                            id="wallet-mnemonic"
-                            rows="3"
-                            class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg resize-y"
-                            placeholder="word word word ..."
-                        ></textarea>
-                    </div>
-                    <div
-                        id="add-wallet-phrase-warning"
-                        class="text-xs mb-2 border border-border border-dashed p-2"
-                        style="visibility: hidden"
-                    >
-                        Write these words down and keep them safe. Anyone with
-                        them can take your funds; if you lose them, your wallet
-                        is gone.
-                    </div>
-                </div>
-
-                <!-- Private key form section -->
-                <div id="add-wallet-section-privkey" class="hidden">
-                    <p class="mb-2">
-                        Paste your private key below. This wallet will have a
-                        single address.
-                    </p>
-                    <div class="mb-2">
-                        <input
-                            type="password"
-                            id="import-private-key"
-                            class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
-                            placeholder="0x..."
-                        />
-                    </div>
-                </div>
-
-                <!-- Extended key (xprv) form section -->
-                <div id="add-wallet-section-xprv" class="hidden">
-                    <p class="mb-2">
-                        Paste your extended private key (xprv) below. This will
-                        import the HD wallet and scan for used addresses.
-                    </p>
-                    <div class="mb-2">
-                        <input
-                            type="password"
-                            id="import-xprv-key"
-                            class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
-                            placeholder="xprv..."
-                        />
-                    </div>
-                </div>
-
-                <!-- Shared password fields -->
                <div class="mb-2" id="add-wallet-password-section">
                    <label class="block mb-1">Choose a password</label>
-                    <p
-                        class="text-xs text-muted mb-1"
-                        id="add-wallet-password-hint"
-                    >
+                    <p class="text-xs text-muted mb-1">
                        This password encrypts your recovery phrase on this
                        device. You will need it to send funds.
                    </p>
@@ -175,6 +107,64 @@
                <button
                    id="btn-add-wallet-confirm"
                    class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer"
+                >
+                    Add
+                </button>
+                <div class="mt-3 text-xs text-muted">
+                    Have a private key instead?
+                    <button
+                        id="btn-add-wallet-import-key"
+                        class="underline cursor-pointer bg-transparent border-none text-fg text-xs font-mono p-0"
+                    >
+                        Import private key
+                    </button>
+                </div>
+            </div>
+
+            <!-- ============ IMPORT PRIVATE KEY ============ -->
+            <div id="view-import-key" class="view hidden">
+                <button
+                    id="btn-import-key-back"
+                    class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer mb-2"
+                >
+                    &lt; Back
+                </button>
+                <h2 class="font-bold mb-2">Import Private Key</h2>
+                <p class="mb-2">
+                    Paste your private key below. This wallet will have a single
+                    address.
+                </p>
+                <div class="mb-2">
+                    <input
+                        type="password"
+                        id="import-private-key"
+                        class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
+                        placeholder="0x..."
+                    />
+                </div>
+                <div class="mb-2" id="import-key-password-section">
+                    <label class="block mb-1">Choose a password</label>
+                    <p class="text-xs text-muted mb-1">
+                        This password encrypts your private key on this device.
+                        You will need it to send funds.
+                    </p>
+                    <input
+                        type="password"
+                        id="import-key-password"
+                        class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
+                    />
+                </div>
+                <div class="mb-2" id="import-key-password-confirm-section">
+                    <label class="block mb-1">Confirm password</label>
+                    <input
+                        type="password"
+                        id="import-key-password-confirm"
+                        class="border border-border p-1 w-full font-mono text-sm bg-bg text-fg"
+                    />
+                </div>
+                <button
+                    id="btn-import-key-confirm"
+                    class="border border-border px-2 py-1 hover:bg-fg hover:text-bg cursor-pointer"
                >
                    Import
                </button>
@@ -185,7 +175,7 @@
                <!-- active address headline -->
                <div
                    id="total-value"
-                    class="text-2xl font-bold min-h-[2rem] text-fg"
+                    class="text-2xl font-bold min-h-[2rem]"
                ></div>
                <div
                    id="total-value-sub"
@@ -376,8 +366,7 @@
                </p>
                <div
                    id="export-privkey-flash"
-                    class="text-xs mb-2 min-h-[1.25rem]"
-                    style="visibility: hidden"
+                    class="text-xs mb-2 hidden"
                ></div>
                <div id="export-privkey-password-section" class="mb-2">
                    <label class="block mb-1">Password</label>
@@ -581,34 +570,16 @@
                    <div class="text-xs text-muted mb-1">Your balance</div>
                    <div id="confirm-balance" class="text-xs"></div>
                </div>
-                <div id="confirm-fee" class="mb-3" style="visibility: hidden">
+                <div id="confirm-fee" class="mb-3 hidden">
                    <div class="text-xs text-muted mb-1">
                        Estimated network fee
                    </div>
                    <div id="confirm-fee-amount" class="text-xs"></div>
                </div>
-                <div
-                    id="confirm-warnings"
-                    class="mb-2"
-                    style="visibility: hidden"
-                ></div>
-                <div
-                    id="confirm-recipient-warning"
-                    class="mb-2"
-                    style="visibility: hidden"
-                >
-                    <div
-                        class="border border-red-500 border-dashed p-2 text-xs font-bold text-red-500"
-                    >
-                        WARNING: The recipient address has ZERO transaction
-                        history. This may indicate a fresh or unused address.
-                        Double-check the address before sending.
-                    </div>
-                </div>
+                <div id="confirm-warnings" class="mb-2 hidden"></div>
                <div
                    id="confirm-errors"
-                    class="mb-2 border border-border border-dashed p-2"
-                    style="visibility: hidden; min-height: 1.25rem"
+                    class="mb-2 border border-border border-dashed p-2 hidden"
                ></div>
                <div class="mb-2">
                    <label class="block mb-1 text-xs">Password</label>
@@ -621,7 +592,6 @@
                <div
                    id="confirm-tx-password-error"
                    class="text-xs mb-2 min-h-[1.25rem]"
-                    style="visibility: hidden"
                ></div>
                <button
                    id="btn-confirm-send"
@@ -736,8 +706,7 @@
                </button>
                <div
                    id="receive-erc20-warning"
-                    class="text-xs border border-border border-dashed p-2 mt-3"
-                    style="visibility: hidden"
+                    class="text-xs border border-border border-dashed p-2 mt-3 hidden"
                ></div>
            </div>

@@ -765,8 +734,7 @@
                </div>
                <div
                    id="add-token-info"
-                    class="text-xs text-muted mb-2 min-h-[1.25rem]"
-                    style="visibility: hidden"
+                    class="text-xs text-muted mb-2 hidden"
                ></div>
                <div class="mb-2">
                    <label class="block mb-1 text-xs text-muted"
@@ -824,7 +792,7 @@
                <div class="bg-well p-3 mx-1 mb-3">
                    <h3 class="font-bold mb-1">Display</h3>
                    <label
-                        class="text-xs flex items-center gap-1 cursor-pointer mb-2"
+                        class="text-xs flex items-center gap-1 cursor-pointer"
                    >
                        <input
                            type="checkbox"
@@ -832,17 +800,6 @@
                        />
                        Show tracked tokens with zero balance
                    </label>
-                    <div class="text-xs flex items-center gap-1">
-                        <label for="settings-theme">Theme:</label>
-                        <select
-                            id="settings-theme"
-                            class="border border-border p-1 bg-bg text-fg text-xs cursor-pointer"
-                        >
-                            <option value="system">System</option>
-                            <option value="light">Light</option>
-                            <option value="dark">Dark</option>
-                        </select>
-                    </div>
                </div>

                <div class="bg-well p-3 mx-1 mb-3">
@@ -924,12 +881,6 @@
                        />
                        <span class="text-xs text-muted">gwei</span>
                    </div>
-                    <label
-                        class="text-xs flex items-center gap-1 cursor-pointer mb-1"
-                    >
-                        <input type="checkbox" id="settings-utc-timestamps" />
-                        UTC Timestamps
-                    </label>
                </div>

                <div class="bg-well p-3 mx-1 mb-3">
@@ -965,8 +916,7 @@
                </p>
                <div
                    id="delete-wallet-flash"
-                    class="text-xs text-red-500 mb-2 min-h-[1.25rem]"
-                    style="visibility: hidden"
+                    class="text-xs text-red-500 mb-2 hidden"
                ></div>
                <div class="mb-2">
                    <label class="block mb-1">Password</label>
@@ -1041,8 +991,7 @@
                    />
                    <div
                        id="settings-addtoken-info"
-                        class="text-xs text-muted mt-1 min-h-[1.25rem]"
-                        style="visibility: hidden"
+                        class="text-xs text-muted mt-1 hidden"
                    ></div>
                    <button
                        id="btn-settings-addtoken-manual"
@@ -1168,8 +1117,7 @@
                </div>
                <div
                    id="approve-tx-error"
-                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem]"
-                    style="visibility: hidden"
+                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem] hidden"
                ></div>
                <div class="flex justify-between">
                    <button
@@ -1197,10 +1145,8 @@

                <div
                    id="approve-sign-danger-warning"
-                    class="mb-3 p-2 text-xs font-bold"
+                    class="hidden mb-3 p-2 text-xs font-bold"
                    style="
-                        visibility: hidden;
-                        min-height: 1.25rem;
                        background: #fee2e2;
                        color: #991b1b;
                        border: 2px solid #dc2626;
@@ -1237,8 +1183,7 @@
                </div>
                <div
                    id="approve-sign-error"
-                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem]"
-                    style="visibility: hidden"
+                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem] hidden"
                ></div>
                <div class="flex justify-between">
                    <button
--- a/src/popup/index.js
+++ b/src/popup/index.js
@@ -6,11 +6,11 @@ const { state, saveState, loadState } = require("../shared/state");
 const { refreshPrices } = require("../shared/prices");
 const { refreshBalances } = require("../shared/balances");
 const { $, showView } = require("./views/helpers");
-const { applyTheme } = require("./theme");

 const home = require("./views/home");
 const welcome = require("./views/welcome");
 const addWallet = require("./views/addWallet");
+const importKey = require("./views/importKey");
 const addressDetail = require("./views/addressDetail");
 const addressToken = require("./views/addressToken");
 const send = require("./views/send");
@@ -54,6 +54,7 @@ const ctx = {
    renderWalletList,
    doRefreshAndRender,
    showAddWalletView: () => addWallet.show(),
+    showImportKeyView: () => importKey.show(),
    showAddressDetail: () => addressDetail.show(),
    showAddressToken: () => addressToken.show(),
    showAddTokenView: () => addToken.show(),
@@ -177,7 +178,6 @@ async function init() {
    }

    await loadState();
-    applyTheme(state.theme);

    // Auto-default active address
    if (
@@ -217,6 +217,7 @@ async function init() {

    welcome.init(ctx);
    addWallet.init(ctx);
+    importKey.init(ctx);
    home.init(ctx);
    addressDetail.init(ctx);
    addressToken.init(ctx);
--- a/src/popup/styles/main.css
+++ b/src/popup/styles/main.css
@@ -15,32 +15,7 @@
    --color-section: #dddddd;
 }

-html.dark {
-    --color-bg: #000000;
-    --color-fg: #ffffff;
-    --color-muted: #aaaaaa;
-    --color-border: #ffffff;
-    --color-border-light: #444444;
-    --color-hover: #222222;
-    --color-well: #1a1a1a;
-    --color-danger-well: #2a0a0a;
-    --color-section: #2a2a2a;
-}
-
 body {
    width: 396px;
    overflow-x: hidden;
 }
-
-/* Copy-flash feedback: inverts colors then fades back */
-.copy-flash-active {
-    background-color: var(--color-fg) !important;
-    color: var(--color-bg) !important;
-    transition: none;
-}
-
-.copy-flash-fade {
-    transition:
-        background-color 225ms ease-out,
-        color 225ms ease-out;
-}
--- a/src/popup/theme.js
+++ b/src/popup/theme.js
@@ -1,33 +0,0 @@
-// Theme management: applies light/dark class to <html> based on preference.
-
-let mediaQuery = null;
-let mediaHandler = null;
-
-function applyTheme(theme) {
-    // Clean up previous system listener
-    if (mediaQuery && mediaHandler) {
-        mediaQuery.removeEventListener("change", mediaHandler);
-        mediaHandler = null;
-    }
-
-    if (theme === "dark") {
-        document.documentElement.classList.add("dark");
-    } else if (theme === "light") {
-        document.documentElement.classList.remove("dark");
-    } else {
-        // system
-        mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
-        const update = () => {
-            if (mediaQuery.matches) {
-                document.documentElement.classList.add("dark");
-            } else {
-                document.documentElement.classList.remove("dark");
-            }
-        };
-        mediaHandler = update;
-        mediaQuery.addEventListener("change", update);
-        update();
-    }
-}
-
-module.exports = { applyTheme };
--- a/src/popup/views/addToken.js
+++ b/src/popup/views/addToken.js
@@ -7,8 +7,7 @@ const { log } = require("../../shared/log");

 function show() {
    $("add-token-address").value = "";
-    $("add-token-info").textContent = "";
-    $("add-token-info").style.visibility = "hidden";
+    $("add-token-info").classList.add("hidden");
    const list = $("common-token-list");
    list.innerHTML = getTopTokens(25)
        .map(
@@ -46,7 +45,7 @@ function init(ctx) {
        }
        const infoEl = $("add-token-info");
        infoEl.textContent = "Looking up token...";
-        infoEl.style.visibility = "visible";
+        infoEl.classList.remove("hidden");
        log.debugf("Looking up token contract", contractAddr);
        try {
            const info = await lookupTokenInfo(contractAddr, state.rpcUrl);
@@ -64,8 +63,7 @@ function init(ctx) {
            const detail = e.shortMessage || e.message || String(e);
            log.errorf("Token lookup failed for", contractAddr, detail);
            showFlash(detail);
-            infoEl.textContent = "";
-            infoEl.style.visibility = "hidden";
+            infoEl.classList.add("hidden");
        }
    });

--- a/src/popup/views/addWallet.js
+++ b/src/popup/views/addWallet.js
@@ -3,299 +3,114 @@ const {
    generateMnemonic,
    hdWalletFromMnemonic,
    isValidMnemonic,
-    addressFromPrivateKey,
-    hdWalletFromXprv,
-    isValidXprv,
 } = require("../../shared/wallet");
 const { encryptWithPassword } = require("../../shared/vault");
 const { state, saveState } = require("../../shared/state");
 const { scanForAddresses } = require("../../shared/balances");

-/**
- * Check if an address already exists in ANY wallet (hd, xprv, or key).
- * Returns the wallet object if found, or undefined.
- */
-function findWalletByAddress(addr) {
-    const lower = addr.toLowerCase();
-    return state.wallets.find((w) =>
-        w.addresses.some((a) => a.address.toLowerCase() === lower),
-    );
-}
-
-/**
- * Check if an xpub already exists in any HD-type wallet (hd or xprv).
- * Returns the wallet object if found, or undefined.
- */
-function findWalletByXpub(xpub) {
-    return state.wallets.find((w) => w.xpub && w.xpub === xpub);
-}
-
-let currentMode = "mnemonic";
-
-const MODES = ["mnemonic", "privkey", "xprv"];
-
-const PASSWORD_HINTS = {
-    mnemonic:
-        "This password encrypts your recovery phrase on this device. You will need it to send funds.",
-    privkey:
-        "This password encrypts your private key on this device. You will need it to send funds.",
-    xprv: "This password encrypts your key on this device. You will need it to send funds.",
-};
-
-function switchMode(mode) {
-    currentMode = mode;
-    for (const m of MODES) {
-        $("add-wallet-section-" + m).classList.toggle("hidden", m !== mode);
-        const tab = $("tab-" + m);
-        const isActive = m === mode;
-        // Active: bold, solid border on top/sides, no bottom border (connects to content)
-        tab.classList.toggle("font-bold", isActive);
-        tab.classList.toggle("border-solid", isActive);
-        tab.classList.toggle("border-border", isActive);
-        tab.classList.toggle("border-b-bg", isActive);
-        tab.classList.toggle("bg-bg", isActive);
-        // Inactive: muted text, dashed border on top/sides, transparent bottom, hover invert
-        tab.classList.toggle("text-muted", !isActive);
-        tab.classList.toggle("border-dashed", !isActive);
-        tab.classList.toggle("border-border-light", !isActive);
-        tab.classList.toggle("border-b-transparent", !isActive);
-        tab.classList.toggle("hover:bg-fg", !isActive);
-        tab.classList.toggle("hover:text-bg", !isActive);
-    }
-    $("add-wallet-password-hint").textContent = PASSWORD_HINTS[mode];
-}
-
 function show() {
    $("wallet-mnemonic").value = "";
-    $("import-private-key").value = "";
-    $("import-xprv-key").value = "";
    $("add-wallet-password").value = "";
    $("add-wallet-password-confirm").value = "";
-    $("add-wallet-phrase-warning").style.visibility = "hidden";
-    switchMode("mnemonic");
+    $("add-wallet-phrase-warning").classList.add("hidden");
    showView("add-wallet");
 }

-function validatePassword() {
-    const pw = $("add-wallet-password").value;
-    const pw2 = $("add-wallet-password-confirm").value;
-    if (!pw) {
-        showFlash("Please choose a password.");
-        return null;
-    }
-    if (pw.length < 12) {
-        showFlash("Password must be at least 12 characters.");
-        return null;
-    }
-    if (pw !== pw2) {
-        showFlash("Passwords do not match.");
-        return null;
-    }
-    return pw;
-}
-
-async function importMnemonic(ctx) {
-    const mnemonic = $("wallet-mnemonic").value.trim();
-    if (!mnemonic) {
-        showFlash("Enter a recovery phrase or press the die to generate one.");
-        return;
-    }
-    const words = mnemonic.split(/\s+/);
-    if (words.length !== 12 && words.length !== 24) {
-        showFlash(
-            "Recovery phrase must be 12 or 24 words. You entered " +
-                words.length +
-                ".",
-        );
-        return;
-    }
-    if (!isValidMnemonic(mnemonic)) {
-        showFlash("Invalid recovery phrase. Check for typos.");
-        return;
-    }
-    const pw = validatePassword();
-    if (!pw) return;
-    const { xpub, firstAddress } = hdWalletFromMnemonic(mnemonic);
-    const xpubDup = findWalletByXpub(xpub);
-    if (xpubDup) {
-        showFlash(
-            "This recovery phrase is already added (" + xpubDup.name + ").",
-        );
-        return;
-    }
-    const addrDup = findWalletByAddress(firstAddress);
-    if (addrDup) {
-        showFlash("Address already exists in wallet (" + addrDup.name + ").");
-        return;
-    }
-    const encrypted = await encryptWithPassword(mnemonic, pw);
-    const walletNum = state.wallets.length + 1;
-    const wallet = {
-        type: "hd",
-        name: "Wallet " + walletNum,
-        xpub: xpub,
-        encryptedSecret: encrypted,
-        nextIndex: 1,
-        addresses: [
-            { address: firstAddress, balance: "0.0000", tokenBalances: [] },
-        ],
-    };
-    state.wallets.push(wallet);
-    state.hasWallet = true;
-    await saveState();
-    ctx.renderWalletList();
-    showView("main");
-
-    // Scan for used HD addresses beyond index 0.
-    showFlash("Scanning for addresses...", 30000);
-    const scan = await scanForAddresses(xpub, state.rpcUrl);
-    if (scan.addresses.length > 1) {
-        wallet.addresses = scan.addresses.map((a) => ({
-            address: a.address,
-            balance: "0.0000",
-            tokenBalances: [],
-        }));
-        wallet.nextIndex = scan.nextIndex;
-        await saveState();
-        ctx.renderWalletList();
-        showFlash("Found " + scan.addresses.length + " addresses.");
-    } else {
-        showFlash("Ready.", 1000);
-    }
-
-    ctx.doRefreshAndRender();
-}
-
-async function importPrivateKey(ctx) {
-    const key = $("import-private-key").value.trim();
-    if (!key) {
-        showFlash("Please enter your private key.");
-        return;
-    }
-    let addr;
-    try {
-        addr = addressFromPrivateKey(key);
-    } catch (e) {
-        showFlash("Invalid private key.");
-        return;
-    }
-    const pw = validatePassword();
-    if (!pw) return;
-    const duplicate = findWalletByAddress(addr);
-    if (duplicate) {
-        showFlash(
-            "This address already exists in wallet (" + duplicate.name + ").",
-        );
-        return;
-    }
-    const encrypted = await encryptWithPassword(key, pw);
-    const walletNum = state.wallets.length + 1;
-    state.wallets.push({
-        type: "key",
-        name: "Wallet " + walletNum,
-        encryptedSecret: encrypted,
-        addresses: [{ address: addr, balance: "0.0000", tokenBalances: [] }],
-    });
-    state.hasWallet = true;
-    await saveState();
-    ctx.renderWalletList();
-    showView("main");
-
-    ctx.doRefreshAndRender();
-}
-
-async function importXprvKey(ctx) {
-    const xprv = $("import-xprv-key").value.trim();
-    if (!xprv) {
-        showFlash("Please enter your extended private key.");
-        return;
-    }
-    if (!isValidXprv(xprv)) {
-        showFlash("Invalid extended private key.");
-        return;
-    }
-    let result;
-    try {
-        result = hdWalletFromXprv(xprv);
-    } catch (e) {
-        showFlash("Invalid extended private key.");
-        return;
-    }
-    const { xpub, firstAddress } = result;
-    const xpubDup = findWalletByXpub(xpub);
-    if (xpubDup) {
-        showFlash("This key is already added (" + xpubDup.name + ").");
-        return;
-    }
-    const addrDup = findWalletByAddress(firstAddress);
-    if (addrDup) {
-        showFlash("Address already exists in wallet (" + addrDup.name + ").");
-        return;
-    }
-    const pw = validatePassword();
-    if (!pw) return;
-    const encrypted = await encryptWithPassword(xprv, pw);
-    const walletNum = state.wallets.length + 1;
-    const wallet = {
-        type: "xprv",
-        name: "Wallet " + walletNum,
-        xpub: xpub,
-        encryptedSecret: encrypted,
-        nextIndex: 1,
-        addresses: [
-            { address: firstAddress, balance: "0.0000", tokenBalances: [] },
-        ],
-    };
-    state.wallets.push(wallet);
-    state.hasWallet = true;
-    await saveState();
-    ctx.renderWalletList();
-    showView("main");
-
-    // Scan for used HD addresses beyond index 0.
-    showFlash("Scanning for addresses...", 30000);
-    const scan = await scanForAddresses(xpub, state.rpcUrl);
-    if (scan.addresses.length > 1) {
-        wallet.addresses = scan.addresses.map((a) => ({
-            address: a.address,
-            balance: "0.0000",
-            tokenBalances: [],
-        }));
-        wallet.nextIndex = scan.nextIndex;
-        await saveState();
-        ctx.renderWalletList();
-        showFlash("Found " + scan.addresses.length + " addresses.");
-    } else {
-        showFlash("Ready.", 1000);
-    }
-
-    ctx.doRefreshAndRender();
-}
-
 function init(ctx) {
-    // Tab click handlers
-    $("tab-mnemonic").addEventListener("click", () => switchMode("mnemonic"));
-    $("tab-privkey").addEventListener("click", () => switchMode("privkey"));
-    $("tab-xprv").addEventListener("click", () => switchMode("xprv"));
-
-    // Generate mnemonic
    $("btn-generate-phrase").addEventListener("click", () => {
        $("wallet-mnemonic").value = generateMnemonic();
-        $("add-wallet-phrase-warning").style.visibility = "visible";
+        $("add-wallet-phrase-warning").classList.remove("hidden");
    });

-    // Import / confirm
    $("btn-add-wallet-confirm").addEventListener("click", async () => {
-        if (currentMode === "mnemonic") {
-            await importMnemonic(ctx);
-        } else if (currentMode === "privkey") {
-            await importPrivateKey(ctx);
-        } else if (currentMode === "xprv") {
-            await importXprvKey(ctx);
+        const mnemonic = $("wallet-mnemonic").value.trim();
+        if (!mnemonic) {
+            showFlash(
+                "Enter a recovery phrase or press the die to generate one.",
+            );
+            return;
        }
+        const words = mnemonic.split(/\s+/);
+        if (words.length !== 12 && words.length !== 24) {
+            showFlash(
+                "Recovery phrase must be 12 or 24 words. You entered " +
+                    words.length +
+                    ".",
+            );
+            return;
+        }
+        if (!isValidMnemonic(mnemonic)) {
+            showFlash("Invalid recovery phrase. Check for typos.");
+            return;
+        }
+        const pw = $("add-wallet-password").value;
+        const pw2 = $("add-wallet-password-confirm").value;
+        if (!pw) {
+            showFlash("Please choose a password.");
+            return;
+        }
+        if (pw.length < 12) {
+            showFlash("Password must be at least 12 characters.");
+            return;
+        }
+        if (pw !== pw2) {
+            showFlash("Passwords do not match.");
+            return;
+        }
+        const { xpub, firstAddress } = hdWalletFromMnemonic(mnemonic);
+        const duplicate = state.wallets.find(
+            (w) =>
+                w.type === "hd" &&
+                w.addresses[0] &&
+                w.addresses[0].address.toLowerCase() ===
+                    firstAddress.toLowerCase(),
+        );
+        if (duplicate) {
+            showFlash(
+                "This recovery phrase is already added (" +
+                    duplicate.name +
+                    ").",
+            );
+            return;
+        }
+        const encrypted = await encryptWithPassword(mnemonic, pw);
+        const walletNum = state.wallets.length + 1;
+        const wallet = {
+            type: "hd",
+            name: "Wallet " + walletNum,
+            xpub: xpub,
+            encryptedSecret: encrypted,
+            nextIndex: 1,
+            addresses: [
+                { address: firstAddress, balance: "0.0000", tokenBalances: [] },
+            ],
+        };
+        state.wallets.push(wallet);
+        state.hasWallet = true;
+        await saveState();
+        ctx.renderWalletList();
+        showView("main");
+
+        // Scan for used HD addresses beyond index 0.
+        showFlash("Scanning for addresses...", 30000);
+        const scan = await scanForAddresses(xpub, state.rpcUrl);
+        if (scan.addresses.length > 1) {
+            wallet.addresses = scan.addresses.map((a) => ({
+                address: a.address,
+                balance: "0.0000",
+                tokenBalances: [],
+            }));
+            wallet.nextIndex = scan.nextIndex;
+            await saveState();
+            ctx.renderWalletList();
+            showFlash("Found " + scan.addresses.length + " addresses.");
+        } else {
+            showFlash("Ready.", 1000);
+        }
+
+        ctx.doRefreshAndRender();
    });

-    // Back button
    $("btn-add-wallet-back").addEventListener("click", () => {
        if (!state.hasWallet) {
            showView("welcome");
@@ -304,6 +119,11 @@ function init(ctx) {
            showView("main");
        }
    });
+
+    $("btn-add-wallet-import-key").addEventListener(
+        "click",
+        ctx.showImportKeyView,
+    );
 }

 module.exports = { init, show };
--- a/src/popup/views/addressDetail.js
+++ b/src/popup/views/addressDetail.js
@@ -2,14 +2,11 @@ const {
    $,
    showView,
    showFlash,
-    flashCopyFeedback,
    balanceLinesForAddress,
    addressDotHtml,
    addressTitle,
    escapeHtml,
    truncateMiddle,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, currentAddress, saveState } = require("../../shared/state");
 const { formatUsd, getAddressValueUsd } = require("../../shared/prices");
@@ -30,6 +27,17 @@ const { getSignerForAddress } = require("../../shared/wallet");

 let ctx;

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
+function etherscanAddressLink(address) {
+    return `https://etherscan.io/address/${address}`;
+}
+
 function show() {
    state.selectedToken = null;
    const wallet = state.wallets[state.selectedWallet];
@@ -47,18 +55,22 @@ function show() {
    img.style.imageRendering = "pixelated";
    img.style.borderRadius = "50%";
    blockieEl.appendChild(img);
-    const addrTitle = addressTitle(addr.address, state.wallets);
-    $("address-line").innerHTML = renderAddressHtml(addr.address, {
-        title: addrTitle,
-        ensName: addr.ensName,
-    });
-    $("address-line").dataset.full = addr.address;
-    attachCopyHandlers($("address-line"));
+    $("address-dot").innerHTML = addressDotHtml(addr.address);
+    $("address-full").dataset.full = addr.address;
+    $("address-full").textContent = addr.address;
+    const addrLink = etherscanAddressLink(addr.address);
+    $("address-etherscan-link").innerHTML =
+        `<a href="${addrLink}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    const usdTotal = formatUsd(getAddressValueUsd(addr));
    $("address-usd-total").innerHTML = usdTotal || "&nbsp;";
    const ensEl = $("address-ens");
-    // ENS is now shown inside renderAddressHtml, hide the separate element
-    ensEl.classList.add("hidden");
+    if (addr.ensName) {
+        ensEl.innerHTML =
+            addressDotHtml(addr.address) + escapeHtml(addr.ensName);
+        ensEl.classList.remove("hidden");
+    } else {
+        ensEl.classList.add("hidden");
+    }
    $("address-balances").innerHTML = balanceLinesForAddress(
        addr,
        state.trackedTokens,
@@ -82,39 +94,18 @@ function show() {
 function isoDate(timestamp) {
    const d = new Date(timestamp * 1000);
    const pad = (n) => String(n).padStart(2, "0");
-    if (state.utcTimestamps) {
-        return (
-            d.getUTCFullYear() +
-            "-" +
-            pad(d.getUTCMonth() + 1) +
-            "-" +
-            pad(d.getUTCDate()) +
-            "T" +
-            pad(d.getUTCHours()) +
-            ":" +
-            pad(d.getUTCMinutes()) +
-            ":" +
-            pad(d.getUTCSeconds()) +
-            "Z"
-        );
-    }
-    const offsetMin = -d.getTimezoneOffset();
-    const sign = offsetMin >= 0 ? "+" : "-";
-    const absOff = Math.abs(offsetMin);
-    const tzStr = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
    return (
        d.getFullYear() +
        "-" +
        pad(d.getMonth() + 1) +
        "-" +
        pad(d.getDate()) +
-        "T" +
+        " " +
        pad(d.getHours()) +
        ":" +
        pad(d.getMinutes()) +
        ":" +
-        pad(d.getSeconds()) +
-        tzStr
+        pad(d.getSeconds())
    );
 }

@@ -245,6 +236,13 @@ function renderTransactions(txs) {

 function init(_ctx) {
    ctx = _ctx;
+    $("address-full").addEventListener("click", () => {
+        const addr = $("address-full").dataset.full;
+        if (addr) {
+            navigator.clipboard.writeText(addr);
+            showFlash("Copied!");
+        }
+    });

    $("btn-address-back").addEventListener("click", () => {
        ctx.renderWalletList();
@@ -308,12 +306,12 @@ function init(_ctx) {
        blockieEl.appendChild(bImg);
        $("export-privkey-title").textContent =
            wallet.name + " \u2014 Address " + (state.selectedAddress + 1);
-        const exportAddrContainer = $("export-privkey-dot").parentElement;
-        exportAddrContainer.innerHTML = renderAddressHtml(addr.address);
-        attachCopyHandlers(exportAddrContainer);
+        $("export-privkey-dot").innerHTML = addressDotHtml(addr.address);
+        $("export-privkey-address").textContent = addr.address;
+        $("export-privkey-address").dataset.full = addr.address;
        $("export-privkey-password").value = "";
+        $("export-privkey-flash").classList.add("hidden");
        $("export-privkey-flash").textContent = "";
-        $("export-privkey-flash").style.visibility = "hidden";
        $("export-privkey-password-section").classList.remove("hidden");
        $("export-privkey-result").classList.add("hidden");
        $("export-privkey-value").textContent = "";
@@ -324,7 +322,7 @@ function init(_ctx) {
        const password = $("export-privkey-password").value;
        if (!password) {
            $("export-privkey-flash").textContent = "Password is required.";
-            $("export-privkey-flash").style.visibility = "visible";
+            $("export-privkey-flash").classList.remove("hidden");
            return;
        }
        const btn = $("btn-export-privkey-confirm");
@@ -345,10 +343,10 @@ function init(_ctx) {
            $("export-privkey-password-section").classList.add("hidden");
            $("export-privkey-value").textContent = privateKey;
            $("export-privkey-result").classList.remove("hidden");
-            $("export-privkey-flash").style.visibility = "hidden";
+            $("export-privkey-flash").classList.add("hidden");
        } catch {
            $("export-privkey-flash").textContent = "Wrong password.";
-            $("export-privkey-flash").style.visibility = "visible";
+            $("export-privkey-flash").classList.remove("hidden");
        } finally {
            btn.disabled = false;
            btn.classList.remove("text-muted");
@@ -360,7 +358,14 @@ function init(_ctx) {
        if (key) {
            navigator.clipboard.writeText(key);
            showFlash("Copied!");
-            flashCopyFeedback($("export-privkey-value"));
+        }
+    });
+
+    $("export-privkey-address").addEventListener("click", () => {
+        const full = $("export-privkey-address").dataset.full;
+        if (full) {
+            navigator.clipboard.writeText(full);
+            showFlash("Copied!");
        }
    });

--- a/src/popup/views/addressToken.js
+++ b/src/popup/views/addressToken.js
@@ -5,14 +5,11 @@ const {
    $,
    showView,
    showFlash,
-    flashCopyFeedback,
    addressDotHtml,
    addressTitle,
    escapeHtml,
    truncateMiddle,
    balanceLine,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, currentAddress, saveState } = require("../../shared/state");
 const { TOKEN_BY_ADDRESS, resolveSymbol } = require("../../shared/tokenList");
@@ -36,42 +33,32 @@ const makeBlockie = require("ethereum-blockies-base64");

 let ctx;

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
+function etherscanAddressLink(address) {
+    return `https://etherscan.io/address/${address}`;
+}
+
 function isoDate(timestamp) {
    const d = new Date(timestamp * 1000);
    const pad = (n) => String(n).padStart(2, "0");
-    if (state.utcTimestamps) {
-        return (
-            d.getUTCFullYear() +
-            "-" +
-            pad(d.getUTCMonth() + 1) +
-            "-" +
-            pad(d.getUTCDate()) +
-            "T" +
-            pad(d.getUTCHours()) +
-            ":" +
-            pad(d.getUTCMinutes()) +
-            ":" +
-            pad(d.getUTCSeconds()) +
-            "Z"
-        );
-    }
-    const offsetMin = -d.getTimezoneOffset();
-    const sign = offsetMin >= 0 ? "+" : "-";
-    const absOff = Math.abs(offsetMin);
-    const tzStr = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
    return (
        d.getFullYear() +
        "-" +
        pad(d.getMonth() + 1) +
        "-" +
        pad(d.getDate()) +
-        "T" +
+        " " +
        pad(d.getHours()) +
        ":" +
        pad(d.getMinutes()) +
        ":" +
-        pad(d.getSeconds()) +
-        tzStr
+        pad(d.getSeconds())
    );
 }

@@ -139,13 +126,12 @@ function show() {
    blockieEl.appendChild(img);

    // Address line
-    const addrTitle = addressTitle(addr.address, state.wallets);
-    $("address-token-line").innerHTML = renderAddressHtml(addr.address, {
-        title: addrTitle,
-        ensName: addr.ensName,
-    });
-    $("address-token-line").dataset.full = addr.address;
-    attachCopyHandlers($("address-token-line"));
+    $("address-token-dot").innerHTML = addressDotHtml(addr.address);
+    $("address-token-full").dataset.full = addr.address;
+    $("address-token-full").textContent = addr.address;
+    const addrLink = etherscanAddressLink(addr.address);
+    $("address-token-etherscan-link").innerHTML =
+        `<a href="${addrLink}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;

    // USD total for this token only
    const usdVal = price ? amount * price : 0;
@@ -185,9 +171,15 @@ function show() {
                    ? knownToken.decimals
                    : null;
        const tokenHolders = tb && tb.holders != null ? tb.holders : null;
+        const dot = addressDotHtml(tokenId);
+        const tokenLink = `https://etherscan.io/token/${escapeHtml(tokenId)}`;
        const projectUrl = knownToken && knownToken.url ? knownToken.url : null;
        let infoHtml = `<div class="font-bold mb-2">Contract Address</div>`;
-        infoHtml += `<div class="mb-2">${renderAddressHtml(tokenId)}</div>`;
+        infoHtml +=
+            `<div class="flex items-center mb-2">${dot}` +
+            `<span class="break-all underline decoration-dashed cursor-pointer" id="address-token-contract-copy" data-copy="${escapeHtml(tokenId)}">${escapeHtml(tokenId)}</span>` +
+            `<a href="${tokenLink}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>` +
+            `</div>`;
        if (tokenName)
            infoHtml += `<div class="mb-1"><span class="text-muted">Name:</span> ${tokenName}</div>`;
        if (tokenSymbol)
@@ -199,7 +191,6 @@ function show() {
        if (projectUrl)
            infoHtml += `<div class="mb-1"><span class="text-muted">Website:</span> <a href="${escapeHtml(projectUrl)}" target="_blank" rel="noopener" class="underline decoration-dashed">${escapeHtml(projectUrl)}</a></div>`;
        contractInfo.innerHTML = infoHtml;
-        attachCopyHandlers(contractInfo);
        contractInfo.classList.remove("hidden");
    } else {
        contractInfo.innerHTML = "";
@@ -321,12 +312,19 @@ function renderTransactions(txs) {

 function init(_ctx) {
    ctx = _ctx;
+    $("address-token-full").addEventListener("click", () => {
+        const addr = $("address-token-full").dataset.full;
+        if (addr) {
+            navigator.clipboard.writeText(addr);
+            showFlash("Copied!");
+        }
+    });
+
    $("address-token-contract-info").addEventListener("click", (e) => {
        const copyEl = e.target.closest("[data-copy]");
        if (copyEl) {
            navigator.clipboard.writeText(copyEl.dataset.copy);
            showFlash("Copied!");
-            flashCopyFeedback(copyEl);
        }
    });

@@ -358,11 +356,25 @@ function init(_ctx) {
        $("send-token").classList.add("hidden");
        let staticHtml = `<div class="font-bold">${escapeHtml(currentSymbol)}</div>`;
        if (tokenId !== "ETH") {
-            staticHtml += `<div class="text-xs">${renderAddressHtml(tokenId)}</div>`;
+            const dot = addressDotHtml(tokenId);
+            const link = `https://etherscan.io/token/${tokenId}`;
+            const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+            staticHtml +=
+                `<div class="flex items-center text-xs">${dot}` +
+                `<span class="break-all underline decoration-dashed cursor-pointer" data-copy="${escapeHtml(tokenId)}">${escapeHtml(tokenId)}</span>` +
+                extLink +
+                `</div>`;
        }
        $("send-token-static").innerHTML = staticHtml;
        $("send-token-static").classList.remove("hidden");
-        attachCopyHandlers($("send-token-static"));
+        // Attach copy handler for the contract address
+        const copyEl = $("send-token-static").querySelector("[data-copy]");
+        if (copyEl) {
+            copyEl.addEventListener("click", () => {
+                navigator.clipboard.writeText(copyEl.dataset.copy);
+                showFlash("Copied!");
+            });
+        }
        updateSendBalance();
        resetSendValidation();
        showView("send");
--- a/src/popup/views/approval.js
+++ b/src/popup/views/approval.js
@@ -1,12 +1,11 @@
 const {
    $,
+    addressDotHtml,
    addressTitle,
    escapeHtml,
    showView,
    showError,
    hideError,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, saveState } = require("../../shared/state");
 const { formatEther, formatUnits, Interface, toUtf8String } = require("ethers");
@@ -18,11 +17,28 @@ const uniswap = require("../../shared/uniswap");
 const runtime =
    typeof browser !== "undefined" ? browser.runtime : chrome.runtime;

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 const erc20Iface = new Interface(ERC20_ABI);

 function approvalAddressHtml(address) {
+    const dot = addressDotHtml(address);
+    const link = `https://etherscan.io/address/${address}`;
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    const title = addressTitle(address, state.wallets);
-    return renderAddressHtml(address, { title });
+    let html = "";
+    if (title) {
+        html += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
+        html += `<div class="break-all">${escapeHtml(address)}${extLink}</div>`;
+    } else {
+        html += `<div class="flex items-center">${dot}<span class="break-all">${escapeHtml(address)}</span>${extLink}</div>`;
+    }
+    return html;
 }

 function formatTxValue(val) {
@@ -37,6 +53,10 @@ function tokenLabel(address) {
    return t ? t.symbol : null;
 }

+function etherscanTokenLink(address) {
+    return `https://etherscan.io/token/${address}`;
+}
+
 // Try to decode calldata using known ABIs.
 // Returns { name, description, details } or null.
 function decodeCalldata(data, toAddress) {
@@ -198,6 +218,10 @@ function showTxApproval(details) {
            toHtml += `<div class="font-bold mb-1">${escapeHtml(symbol)}</div>`;
        }
        toHtml += approvalAddressHtml(toAddr);
+        if (symbol) {
+            const link = etherscanTokenLink(toAddr);
+            toHtml = toHtml.replace("</div>", "") + ""; // approvalAddressHtml already has etherscan link
+        }
        $("approve-tx-to").innerHTML = toHtml;
    } else {
        $("approve-tx-to").innerHTML = escapeHtml("(contract creation)");
@@ -219,9 +243,12 @@ function showTxApproval(details) {
            detailsHtml += `<div class="text-muted">${escapeHtml(d.label)}</div>`;
            if (d.address) {
                if (d.isToken) {
+                    const tLink = etherscanTokenLink(d.address);
                    detailsHtml += `<div class="font-bold">${escapeHtml(tokenLabel(d.address) || "Unknown token")}</div>`;
+                    detailsHtml += approvalAddressHtml(d.address);
+                } else {
+                    detailsHtml += approvalAddressHtml(d.address);
                }
-                detailsHtml += approvalAddressHtml(d.address);
            } else {
                detailsHtml += `<div class="font-bold">${escapeHtml(d.value)}</div>`;
            }
@@ -242,10 +269,9 @@ function showTxApproval(details) {
    }

    $("approve-tx-password").value = "";
-    hideError("approve-tx-error");
+    $("approve-tx-error").classList.add("hidden");

    showView("approve-tx");
-    attachCopyHandlers("view-approve-tx");
 }

 function decodeHexMessage(hex) {
@@ -325,10 +351,10 @@ function showSignApproval(details) {
    if (warningEl) {
        if (sp.dangerWarning) {
            warningEl.textContent = sp.dangerWarning;
-            warningEl.style.visibility = "visible";
+            warningEl.classList.remove("hidden");
        } else {
            warningEl.textContent = "";
-            warningEl.style.visibility = "hidden";
+            warningEl.classList.add("hidden");
        }
    }

@@ -338,7 +364,6 @@ function showSignApproval(details) {
    $("btn-approve-sign").classList.remove("text-muted");

    showView("approve-sign");
-    attachCopyHandlers("view-approve-sign");
 }

 function show(id) {
@@ -361,7 +386,6 @@ function show(id) {
        $("approve-address").innerHTML = approvalAddressHtml(
            state.activeAddress,
        );
-        attachCopyHandlers("view-approve-site");
        $("approve-remember").checked = state.rememberSiteChoice;
    });
 }
--- a/src/popup/views/confirmTx.js
+++ b/src/popup/views/confirmTx.js
@@ -15,11 +15,9 @@ const {
    hideError,
    showView,
    showFlash,
-    flashCopyFeedback,
    addressTitle,
+    addressDotHtml,
    escapeHtml,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state } = require("../../shared/state");
 const { getSignerForAddress } = require("../../shared/wallet");
@@ -27,11 +25,19 @@ const { decryptWithPassword } = require("../../shared/vault");
 const { formatUsd, getPrice } = require("../../shared/prices");
 const { getProvider } = require("../../shared/balances");
 const { isScamAddress } = require("../../shared/scamlist");
+const { hasTransactionHistory } = require("../../shared/transactions");
 const { ERC20_ABI } = require("../../shared/constants");
 const { log } = require("../../shared/log");
 const makeBlockie = require("ethereum-blockies-base64");
 const txStatus = require("./txStatus");

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 let pendingTx = null;

 function restore() {
@@ -41,6 +47,14 @@ function restore() {
    }
 }

+function etherscanTokenLink(address) {
+    return `https://etherscan.io/token/${address}`;
+}
+
+function etherscanAddressLink(address) {
+    return `https://etherscan.io/address/${address}`;
+}
+
 function blockieHtml(address) {
    const src = makeBlockie(address);
    return `<img src="${src}" width="48" height="48" style="image-rendering:pixelated;border-radius:50%;display:inline-block">`;
@@ -48,10 +62,22 @@ function blockieHtml(address) {

 function confirmAddressHtml(address, ensName, title) {
    const blockie = blockieHtml(address);
-    return (
-        `<div class="mb-1">${blockie}</div>` +
-        renderAddressHtml(address, { title, ensName })
-    );
+    const dot = addressDotHtml(address);
+    const link = etherscanAddressLink(address);
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+    let html = `<div class="mb-1">${blockie}</div>`;
+    if (title) {
+        html += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
+    }
+    if (ensName) {
+        html += `<div class="flex items-center font-bold">${title ? "" : dot}${escapeHtml(ensName)}</div>`;
+    }
+    html +=
+        `<div class="flex items-center">${title || ensName ? "" : dot}` +
+        `<span class="break-all">${escapeHtml(address)}</span>` +
+        extLink +
+        `</div>`;
+    return html;
 }

 function valueWithUsd(text, usdAmount) {
@@ -78,12 +104,22 @@ function show(txInfo) {
    // Token contract section (ERC-20 only)
    const tokenSection = $("confirm-token-section");
    if (isErc20) {
-        $("confirm-token-contract").innerHTML = renderAddressHtml(
-            txInfo.token,
-            {},
-        );
+        const dot = addressDotHtml(txInfo.token);
+        const link = etherscanTokenLink(txInfo.token);
+        $("confirm-token-contract").innerHTML =
+            `<div class="flex items-center">${dot}` +
+            `<span class="break-all underline decoration-dashed cursor-pointer" data-copy="${escapeHtml(txInfo.token)}">${escapeHtml(txInfo.token)}</span>` +
+            `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>` +
+            `</div>`;
        tokenSection.classList.remove("hidden");
-        attachCopyHandlers(tokenSection);
+        // Attach click-to-copy on the contract address
+        const copyEl = tokenSection.querySelector("[data-copy]");
+        if (copyEl) {
+            copyEl.onclick = () => {
+                navigator.clipboard.writeText(copyEl.dataset.copy);
+                showFlash("Copied!");
+            };
+        }
    } else {
        tokenSection.classList.add("hidden");
    }
@@ -149,10 +185,9 @@ function show(txInfo) {
                    `<div class="border border-border border-dashed p-2 mb-1 text-xs font-bold">WARNING: ${w}</div>`,
            )
            .join("");
-        warningsEl.style.visibility = "visible";
+        warningsEl.classList.remove("hidden");
    } else {
-        warningsEl.innerHTML = "";
-        warningsEl.style.visibility = "hidden";
+        warningsEl.classList.add("hidden");
    }

    // Check for errors
@@ -190,12 +225,11 @@ function show(txInfo) {
        errorsEl.innerHTML = errors
            .map((e) => `<div class="text-xs">${e}</div>`)
            .join("");
-        errorsEl.style.visibility = "visible";
+        errorsEl.classList.remove("hidden");
        sendBtn.disabled = true;
        sendBtn.classList.add("text-muted");
    } else {
-        errorsEl.innerHTML = "";
-        errorsEl.style.visibility = "hidden";
+        errorsEl.classList.add("hidden");
        sendBtn.disabled = false;
        sendBtn.classList.remove("text-muted");
    }
@@ -205,14 +239,10 @@ function show(txInfo) {
    hideError("confirm-tx-password-error");

    // Gas estimate — show placeholder then fetch async
-    $("confirm-fee").style.visibility = "visible";
+    $("confirm-fee").classList.remove("hidden");
    $("confirm-fee-amount").textContent = "Estimating...";
    state.viewData = { pendingTx: txInfo };
    showView("confirm-tx");
-    attachCopyHandlers("view-confirm-tx");
-
-    // Reset recipient warning to hidden (space always reserved, no layout shift)
-    $("confirm-recipient-warning").style.visibility = "hidden";

    estimateGas(txInfo);
    checkRecipientHistory(txInfo);
@@ -259,19 +289,24 @@ async function estimateGas(txInfo) {
 }

 async function checkRecipientHistory(txInfo) {
-    const el = $("confirm-recipient-warning");
    try {
-        const provider = getProvider(state.rpcUrl);
-        // Skip warning for contract addresses — they may legitimately
-        // have zero outgoing transactions (getTransactionCount returns
-        // the nonce, i.e. sent-tx count only).
-        const code = await provider.getCode(txInfo.to);
-        if (code && code !== "0x") {
-            return;
-        }
-        const txCount = await provider.getTransactionCount(txInfo.to);
-        if (txCount === 0) {
-            el.style.visibility = "visible";
+        const hasHistory = await hasTransactionHistory(
+            txInfo.to,
+            state.blockscoutUrl,
+        );
+        if (hasHistory === false) {
+            const warningsEl = $("confirm-warnings");
+            const warningDiv = document.createElement("div");
+            warningDiv.className =
+                "border border-dashed p-2 mb-1 text-xs font-bold";
+            warningDiv.style.color = "#dc2626";
+            warningDiv.style.borderColor = "#dc2626";
+            warningDiv.textContent =
+                "WARNING: This address has ZERO transaction history on-chain. " +
+                "It has never sent or received any transactions. " +
+                "Double-check the address before sending.";
+            warningsEl.appendChild(warningDiv);
+            warningsEl.classList.remove("hidden");
        }
    } catch (e) {
        log.errorf("recipient history check failed:", e.message);
--- a/src/popup/views/deleteWallet.js
+++ b/src/popup/views/deleteWallet.js
@@ -12,7 +12,7 @@ function show(walletIdx) {
        wallet.name || "Wallet " + (walletIdx + 1);
    $("delete-wallet-password").value = "";
    $("delete-wallet-flash").textContent = "";
-    $("delete-wallet-flash").style.visibility = "hidden";
+    $("delete-wallet-flash").classList.add("hidden");
    showView("delete-wallet-confirm");
 }

@@ -29,14 +29,14 @@ function init(_ctx) {
        if (!pw) {
            $("delete-wallet-flash").textContent =
                "Please enter your password.";
-            $("delete-wallet-flash").style.visibility = "visible";
+            $("delete-wallet-flash").classList.remove("hidden");
            return;
        }

        if (deleteWalletIndex === null) {
            $("delete-wallet-flash").textContent =
                "No wallet selected for deletion.";
-            $("delete-wallet-flash").style.visibility = "visible";
+            $("delete-wallet-flash").classList.remove("hidden");
            return;
        }

@@ -52,7 +52,7 @@ function init(_ctx) {
            await decryptWithPassword(wallet.encryptedSecret, pw);
        } catch (_e) {
            $("delete-wallet-flash").textContent = "Wrong password.";
-            $("delete-wallet-flash").style.visibility = "visible";
+            $("delete-wallet-flash").classList.remove("hidden");
            btn.disabled = false;
            btn.classList.remove("text-muted");
            return;
--- a/src/popup/views/helpers.js
+++ b/src/popup/views/helpers.js
@@ -13,6 +13,7 @@ const { state, saveState } = require("../../shared/state");
 const VIEWS = [
    "welcome",
    "add-wallet",
+    "import-key",
    "main",
    "address",
    "address-token",
@@ -40,13 +41,11 @@ function $(id) {
 function showError(id, msg) {
    const el = $(id);
    el.textContent = msg;
-    el.style.visibility = "visible";
+    el.classList.remove("hidden");
 }

 function hideError(id) {
-    const el = $(id);
-    el.textContent = "";
-    el.style.visibility = "hidden";
+    $(id).classList.add("hidden");
 }

 function showView(name) {
@@ -208,47 +207,38 @@ function addressTitle(address, wallets) {
 // Render an address with color dot, optional ENS name, optional title,
 // and optional truncation. Title and ENS are shown as bold labels above
 // the full address.
-// Delegates to renderAddressHtml for consistent output.
 function formatAddressHtml(address, ensName, maxLen, title) {
-    return renderAddressHtml(address, { title, ensName, maxLen });
+    const dot = addressDotHtml(address);
+    const displayAddr = maxLen ? truncateMiddle(address, maxLen) : address;
+    if (title || ensName) {
+        let html = "";
+        if (title) {
+            html += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
+        }
+        if (ensName) {
+            html += `<div class="flex items-center font-bold">${title ? "" : dot}${escapeHtml(ensName)}</div>`;
+        }
+        html += `<div class="break-all">${escapeHtml(displayAddr)}</div>`;
+        return html;
+    }
+    return `<div class="flex items-center">${dot}<span class="break-all">${escapeHtml(displayAddr)}</span></div>`;
 }

 function isoDate(timestamp) {
    const d = new Date(timestamp * 1000);
    const pad = (n) => String(n).padStart(2, "0");
-    if (state.utcTimestamps) {
-        return (
-            d.getUTCFullYear() +
-            "-" +
-            pad(d.getUTCMonth() + 1) +
-            "-" +
-            pad(d.getUTCDate()) +
-            "T" +
-            pad(d.getUTCHours()) +
-            ":" +
-            pad(d.getUTCMinutes()) +
-            ":" +
-            pad(d.getUTCSeconds()) +
-            "Z"
-        );
-    }
-    const offsetMin = -d.getTimezoneOffset();
-    const sign = offsetMin >= 0 ? "+" : "-";
-    const absOff = Math.abs(offsetMin);
-    const tzStr = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
    return (
        d.getFullYear() +
        "-" +
        pad(d.getMonth() + 1) +
        "-" +
        pad(d.getDate()) +
-        "T" +
+        " " +
        pad(d.getHours()) +
        ":" +
        pad(d.getMinutes()) +
        ":" +
-        pad(d.getSeconds()) +
-        tzStr
+        pad(d.getSeconds())
    );
 }

@@ -269,111 +259,12 @@ function timeAgo(timestamp) {
    return years + " year" + (years !== 1 ? "s" : "") + " ago";
 }

-// Shared external-link icon SVG used across all views.
-const EXT_ICON =
-    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
-    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
-    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
-    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
-    `</svg></span>`;
-
-function etherscanAddressUrl(address) {
-    return `https://etherscan.io/address/${address}`;
-}
-
-function etherscanLinkHtml(url) {
-    return (
-        `<a href="${url}" target="_blank" rel="noopener" ` +
-        `class="inline-flex items-center">${EXT_ICON}</a>`
-    );
-}
-
-// Render a copyable text span with dashed underline affordance.
-// The caller must attach click handlers via attachCopyHandlers() or
-// manually wire up [data-copy] elements after inserting the HTML.
-function copyableHtml(text, extraClass) {
-    const cls =
-        "underline decoration-dashed cursor-pointer" +
-        (extraClass ? " " + extraClass : "");
-    return `<span class="${cls}" data-copy="${escapeHtml(text)}">${escapeHtml(text)}</span>`;
-}
-
-// Attach click-to-copy handlers to all [data-copy] elements within
-// a container.  Safe to call multiple times on the same container.
-function attachCopyHandlers(container) {
-    const root =
-        typeof container === "string"
-            ? document.getElementById(container)
-            : container;
-    if (!root) return;
-    root.querySelectorAll("[data-copy]").forEach((el) => {
-        el.onclick = () => {
-            navigator.clipboard.writeText(el.dataset.copy);
-            showFlash("Copied!");
-            flashCopyFeedback(el);
-        };
-    });
-}
-
-// Unified address rendering.
-//
-// Produces consistent HTML for any Ethereum address:
-//   • Color dot
-//   • Optional title (e.g. "Wallet 1 — Address 2") shown bold above address
-//   • Optional ENS name shown bold above address
-//   • Full address (or truncated via maxLen) with dashed-underline click-to-copy
-//   • Etherscan external link icon
-//
-// Options object:
-//   title    — wallet title string (from addressTitle)
-//   ensName  — ENS name string
-//   maxLen   — if set, truncate address display (min 32 chars enforced)
-//   noLink   — if true, omit etherscan link
-//
-// After inserting the returned HTML into the DOM, call
-// attachCopyHandlers() on the parent to wire up click-to-copy.
-function renderAddressHtml(address, opts) {
-    const { title, ensName, maxLen, noLink } = opts || {};
-    const dot = addressDotHtml(address);
-    const displayAddr = maxLen ? truncateMiddle(address, maxLen) : address;
-    const link = etherscanAddressUrl(address);
-    const extLink = noLink ? "" : etherscanLinkHtml(link);
-
-    let html = "";
-    if (title) {
-        html += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
-    }
-    if (ensName) {
-        html += `<div class="flex items-center font-bold">${title ? "" : dot}${escapeHtml(ensName)}</div>`;
-    }
-    if (title || ensName) {
-        html += `<div class="flex items-center">${copyableHtml(displayAddr, "break-all")}${extLink}</div>`;
-    } else {
-        html += `<div class="flex items-center">${dot}${copyableHtml(displayAddr, "break-all")}${extLink}</div>`;
-    }
-    return html;
-}
-
-function flashCopyFeedback(el) {
-    if (!el) return;
-    el.classList.remove("copy-flash-fade");
-    el.classList.add("copy-flash-active");
-    setTimeout(() => {
-        el.classList.remove("copy-flash-active");
-        el.classList.add("copy-flash-fade");
-        setTimeout(() => {
-            el.classList.remove("copy-flash-fade");
-        }, 275);
-    }, 75);
-}
-
 module.exports = {
    $,
    showError,
    hideError,
    showView,
    showFlash,
-    flashCopyFeedback,
    balanceLine,
    balanceLinesForAddress,
    addressColor,
@@ -381,12 +272,6 @@ module.exports = {
    escapeHtml,
    addressTitle,
    formatAddressHtml,
-    renderAddressHtml,
-    copyableHtml,
-    attachCopyHandlers,
-    etherscanAddressUrl,
-    etherscanLinkHtml,
-    EXT_ICON,
    truncateMiddle,
    isoDate,
    timeAgo,
--- a/src/popup/views/home.js
+++ b/src/popup/views/home.js
@@ -2,7 +2,6 @@ const {
    $,
    showView,
    showFlash,
-    flashCopyFeedback,
    balanceLinesForAddress,
    isoDate,
    timeAgo,
@@ -10,8 +9,6 @@ const {
    addressTitle,
    escapeHtml,
    truncateMiddle,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, saveState, currentAddress } = require("../../shared/state");
 const {
@@ -71,12 +68,27 @@ function renderTotalValue() {
    }
 }

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 function renderActiveAddress() {
    const el = $("active-address-display");
    if (!el) return;
    if (state.activeAddress) {
-        el.innerHTML = renderAddressHtml(state.activeAddress);
-        attachCopyHandlers(el);
+        const addr = state.activeAddress;
+        const dot = addressDotHtml(addr);
+        const link = `https://etherscan.io/address/${addr}`;
+        el.innerHTML =
+            `<span class="underline decoration-dashed cursor-pointer" id="active-addr-copy">${dot}${escapeHtml(addr)}</span>` +
+            `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+        $("active-addr-copy").addEventListener("click", () => {
+            navigator.clipboard.writeText(addr);
+            showFlash("Copied!");
+        });
    } else {
        el.textContent = "";
    }
@@ -227,7 +239,7 @@ function render(ctx) {
        html += `<div>`;
        html += `<div class="flex justify-between items-center bg-section py-1 px-2" style="margin:0 -0.5rem">`;
        html += `<span class="font-bold cursor-pointer wallet-name underline decoration-dashed" data-wallet="${wi}">${wallet.name}</span>`;
-        if (wallet.type === "hd" || wallet.type === "xprv") {
+        if (wallet.type === "hd") {
            html += `<button class="btn-add-address border border-border px-1 hover:bg-fg hover:text-bg cursor-pointer text-xs" data-wallet="${wi}" title="Add another address to this wallet">+</button>`;
        }
        html += `</div>`;
--- a/src/popup/views/importKey.js
+++ b/src/popup/views/importKey.js
@@ -0,0 +1,69 @@
+const { $, showView, showFlash } = require("./helpers");
+const { addressFromPrivateKey } = require("../../shared/wallet");
+const { encryptWithPassword } = require("../../shared/vault");
+const { state, saveState } = require("../../shared/state");
+
+function show() {
+    $("import-private-key").value = "";
+    $("import-key-password").value = "";
+    $("import-key-password-confirm").value = "";
+    showView("import-key");
+}
+
+function init(ctx) {
+    $("btn-import-key-confirm").addEventListener("click", async () => {
+        const key = $("import-private-key").value.trim();
+        if (!key) {
+            showFlash("Please enter your private key.");
+            return;
+        }
+        let addr;
+        try {
+            addr = addressFromPrivateKey(key);
+        } catch (e) {
+            showFlash("Invalid private key.");
+            return;
+        }
+        const pw = $("import-key-password").value;
+        const pw2 = $("import-key-password-confirm").value;
+        if (!pw) {
+            showFlash("Please choose a password.");
+            return;
+        }
+        if (pw.length < 12) {
+            showFlash("Password must be at least 12 characters.");
+            return;
+        }
+        if (pw !== pw2) {
+            showFlash("Passwords do not match.");
+            return;
+        }
+        const encrypted = await encryptWithPassword(key, pw);
+        const walletNum = state.wallets.length + 1;
+        state.wallets.push({
+            type: "key",
+            name: "Wallet " + walletNum,
+            encryptedSecret: encrypted,
+            addresses: [
+                { address: addr, balance: "0.0000", tokenBalances: [] },
+            ],
+        });
+        state.hasWallet = true;
+        await saveState();
+        ctx.renderWalletList();
+        showView("main");
+
+        ctx.doRefreshAndRender();
+    });
+
+    $("btn-import-key-back").addEventListener("click", () => {
+        if (!state.hasWallet) {
+            showView("welcome");
+        } else {
+            ctx.renderWalletList();
+            showView("main");
+        }
+    });
+}
+
+module.exports = { init, show };
--- a/src/popup/views/receive.js
+++ b/src/popup/views/receive.js
@@ -2,14 +2,19 @@ const {
    $,
    showView,
    showFlash,
-    flashCopyFeedback,
    formatAddressHtml,
    addressTitle,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, currentAddress } = require("../../shared/state");
 const QRCode = require("qrcode");

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 function show() {
    const addr = currentAddress();
    const address = addr ? addr.address : "";
@@ -19,8 +24,10 @@ function show() {
        ? formatAddressHtml(address, ensName, null, title)
        : "";
    $("receive-address-block").dataset.full = address;
-    // Etherscan link is now included in formatAddressHtml via renderAddressHtml
-    $("receive-etherscan-link").innerHTML = "";
+    const link = address ? `https://etherscan.io/address/${address}` : "";
+    $("receive-etherscan-link").innerHTML = link
+        ? `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`
+        : "";
    if (address) {
        QRCode.toCanvas($("receive-qr"), address, {
            width: 200,
@@ -45,22 +52,27 @@ function show() {
            "This is an ERC-20 token. Only send " +
            symbol +
            " on the Ethereum network to this address. Sending tokens on other networks will result in permanent loss.";
-        warningEl.style.visibility = "visible";
+        warningEl.classList.remove("hidden");
    } else {
-        warningEl.textContent = "";
-        warningEl.style.visibility = "hidden";
+        warningEl.classList.add("hidden");
    }
    showView("receive");
-    attachCopyHandlers("view-receive");
 }

 function init(ctx) {
+    $("receive-address-block").addEventListener("click", () => {
+        const addr = $("receive-address-block").dataset.full;
+        if (addr) {
+            navigator.clipboard.writeText(addr);
+            showFlash("Copied!");
+        }
+    });
+
    $("btn-receive-copy").addEventListener("click", () => {
        const addr = $("receive-address-block").dataset.full;
        if (addr) {
            navigator.clipboard.writeText(addr);
            showFlash("Copied!");
-            flashCopyFeedback($("receive-address-block"));
        }
    });

--- a/src/popup/views/send.js
+++ b/src/popup/views/send.js
@@ -3,10 +3,9 @@
 const {
    $,
    showFlash,
+    addressDotHtml,
    addressTitle,
    escapeHtml,
-    renderAddressHtml,
-    attachCopyHandlers,
 } = require("./helpers");
 const { state, currentAddress } = require("../../shared/state");
 let ctx;
@@ -114,6 +113,13 @@ function updateToValidation() {
    }
 }

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 function isSpoofedToken(t) {
    const upper = (t.symbol || "").toUpperCase();
    if (!KNOWN_SYMBOLS.has(upper)) return false;
@@ -142,12 +148,24 @@ function renderSendTokenSelect(addr) {
 function updateSendBalance() {
    const addr = currentAddress();
    if (!addr) return;
+    const dot = addressDotHtml(addr.address);
+    const link = `https://etherscan.io/address/${addr.address}`;
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    const title = addressTitle(addr.address, state.wallets);
-    $("send-from").innerHTML = renderAddressHtml(addr.address, {
-        title,
-        ensName: addr.ensName,
-    });
-    attachCopyHandlers($("send-from"));
+    let fromHtml = "";
+    if (title) {
+        fromHtml += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
+        if (addr.ensName) {
+            fromHtml += `<div>${escapeHtml(addr.ensName)}</div>`;
+        }
+        fromHtml += `<div class="break-all">${escapeHtml(addr.address)}${extLink}</div>`;
+    } else if (addr.ensName) {
+        fromHtml += `<div class="flex items-center font-bold">${dot}${escapeHtml(addr.ensName)}</div>`;
+        fromHtml += `<div class="break-all">${escapeHtml(addr.address)}${extLink}</div>`;
+    } else {
+        fromHtml += `<div class="flex items-center">${dot}<span class="break-all">${escapeHtml(addr.address)}</span>${extLink}</div>`;
+    }
+    $("send-from").innerHTML = fromHtml;
    const token = state.selectedToken || $("send-token").value;
    if (token === "ETH") {
        $("send-balance").textContent =
--- a/src/popup/views/settings.js
+++ b/src/popup/views/settings.js
@@ -1,5 +1,4 @@
 const { $, showView, showFlash, escapeHtml } = require("./helpers");
-const { applyTheme } = require("../theme");
 const { state, saveState } = require("../../shared/state");
 const { ETHEREUM_MAINNET_CHAIN_ID } = require("../../shared/constants");
 const { log, debugFetch } = require("../../shared/log");
@@ -215,13 +214,6 @@ function init(ctx) {
        await saveState();
    });

-    $("settings-theme").value = state.theme;
-    $("settings-theme").addEventListener("change", async () => {
-        state.theme = $("settings-theme").value;
-        await saveState();
-        applyTheme(state.theme);
-    });
-
    $("settings-hide-low-holders").checked = state.hideLowHolderTokens;
    $("settings-hide-low-holders").addEventListener("change", async () => {
        state.hideLowHolderTokens = $("settings-hide-low-holders").checked;
@@ -249,12 +241,6 @@ function init(ctx) {
        }
    });

-    $("settings-utc-timestamps").checked = state.utcTimestamps;
-    $("settings-utc-timestamps").addEventListener("change", async () => {
-        state.utcTimestamps = $("settings-utc-timestamps").checked;
-        await saveState();
-    });
-
    $("btn-main-add-wallet").addEventListener("click", ctx.showAddWalletView);

    $("btn-settings-add-token").addEventListener(
--- a/src/popup/views/settingsAddToken.js
+++ b/src/popup/views/settingsAddToken.js
@@ -73,8 +73,7 @@ function renderDropdown() {

 function show() {
    $("settings-addtoken-address").value = "";
-    $("settings-addtoken-info").textContent = "";
-    $("settings-addtoken-info").style.visibility = "hidden";
+    $("settings-addtoken-info").classList.add("hidden");
    renderTop10();
    renderDropdown();
    showView("settings-addtoken");
@@ -130,7 +129,7 @@ function init(_ctx) {
        }
        const infoEl = $("settings-addtoken-info");
        infoEl.textContent = "Looking up token...";
-        infoEl.style.visibility = "visible";
+        infoEl.classList.remove("hidden");
        log.debugf("Looking up token contract", addr);
        try {
            const info = await lookupTokenInfo(addr, state.rpcUrl);
@@ -144,8 +143,7 @@ function init(_ctx) {
            await saveState();
            showFlash("Added " + info.symbol);
            $("settings-addtoken-address").value = "";
-            infoEl.textContent = "";
-            infoEl.style.visibility = "hidden";
+            infoEl.classList.add("hidden");
            renderTop10();
            renderDropdown();
            ctx.doRefreshAndRender();
@@ -153,8 +151,7 @@ function init(_ctx) {
            const detail = e.shortMessage || e.message || String(e);
            log.errorf("Token lookup failed for", addr, detail);
            showFlash(detail);
-            infoEl.textContent = "";
-            infoEl.style.visibility = "hidden";
+            infoEl.classList.add("hidden");
        }
    });
 }
--- a/src/popup/views/transactionDetail.js
+++ b/src/popup/views/transactionDetail.js
@@ -5,34 +5,72 @@ const {
    $,
    showView,
    showFlash,
-    flashCopyFeedback,
+    addressDotHtml,
    addressTitle,
    escapeHtml,
    isoDate,
    timeAgo,
-    renderAddressHtml,
-    attachCopyHandlers,
-    copyableHtml,
-    etherscanLinkHtml,
 } = require("./helpers");
 const { state } = require("../../shared/state");
 const makeBlockie = require("ethereum-blockies-base64");
 const { log, debugFetch } = require("../../shared/log");
 const { decodeCalldata } = require("./approval");

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 let ctx;

+function copyableHtml(text, extraClass) {
+    const cls =
+        "underline decoration-dashed cursor-pointer" +
+        (extraClass ? " " + extraClass : "");
+    return `<span class="${cls}" data-copy="${escapeHtml(text)}">${escapeHtml(text)}</span>`;
+}
+
 function blockieHtml(address) {
    const src = makeBlockie(address);
    return `<img src="${src}" width="48" height="48" style="image-rendering:pixelated;border-radius:50%;display:inline-block">`;
 }

+function etherscanLinkHtml(url) {
+    return (
+        `<a href="${url}" target="_blank" rel="noopener" ` +
+        `class="inline-flex items-center"` +
+        `>${EXT_ICON}</a>`
+    );
+}
+
 function txAddressHtml(address, ensName, title) {
    const blockie = blockieHtml(address);
-    return (
-        `<div class="mb-1">${blockie}</div>` +
-        renderAddressHtml(address, { title, ensName })
-    );
+    const dot = addressDotHtml(address);
+    const link = `https://etherscan.io/address/${address}`;
+    const extLink = etherscanLinkHtml(link);
+    let html = `<div class="mb-1">${blockie}</div>`;
+    if (title) {
+        html += `<div class="font-bold">${escapeHtml(title)}</div>`;
+    }
+    if (ensName) {
+        html +=
+            `<div class="flex items-center">${dot}` +
+            copyableHtml(ensName, "") +
+            `</div>` +
+            `<div class="flex items-center">${dot}` +
+            copyableHtml(address, "break-all") +
+            extLink +
+            `</div>`;
+    } else {
+        html +=
+            `<div class="flex items-center">${dot}` +
+            copyableHtml(address, "break-all") +
+            extLink +
+            `</div>`;
+    }
+    return html;
 }

 function txHashHtml(hash) {
@@ -120,12 +158,20 @@ function render() {
        loadCalldata(tx.hash, tx.to);
    }

-    const isoStr = isoDate(tx.timestamp);
-    $("tx-detail-time").innerHTML =
-        copyableHtml(isoStr) + " (" + escapeHtml(timeAgo(tx.timestamp)) + ")";
+    $("tx-detail-time").textContent =
+        isoDate(tx.timestamp) + " (" + timeAgo(tx.timestamp) + ")";
    $("tx-detail-status").textContent = tx.isError ? "Failed" : "Success";
    showView("transaction");
-    attachCopyHandlers("view-transaction");
+
+    document
+        .getElementById("view-transaction")
+        .querySelectorAll("[data-copy]")
+        .forEach((el) => {
+            el.onclick = () => {
+                navigator.clipboard.writeText(el.dataset.copy);
+                showFlash("Copied!");
+            };
+        });
 }

 async function loadCalldata(txHash, toAddress) {
@@ -158,14 +204,19 @@ async function loadCalldata(txHash, toAddress) {
                detailsHtml += `<div class="mb-2">`;
                detailsHtml += `<div class="text-muted">${escapeHtml(d.label)}</div>`;
                if (d.address && d.isToken) {
-                    // Token entry: show symbol on its own line, then address via shared renderer
+                    // Token entry: show symbol on its own line, then dot + address + Etherscan link
+                    const dot = addressDotHtml(d.address);
                    const tokenSymbol = d.value.match(/^(\S+)\s*\(/)?.[1];
                    if (tokenSymbol) {
                        detailsHtml += `<div class="font-bold">${escapeHtml(tokenSymbol)}</div>`;
                    }
-                    detailsHtml += renderAddressHtml(d.address);
+                    const etherscanUrl = `https://etherscan.io/token/${d.address}`;
+                    detailsHtml += `<div class="flex items-center">${dot}${copyableHtml(d.address, "break-all")}${etherscanLinkHtml(etherscanUrl)}</div>`;
                } else if (d.address) {
-                    detailsHtml += renderAddressHtml(d.address);
+                    // Protocol/contract entry: show name + Etherscan link
+                    const dot = addressDotHtml(d.address);
+                    const etherscanUrl = `https://etherscan.io/address/${d.address}`;
+                    detailsHtml += `<div class="flex items-center">${dot}${copyableHtml(d.value, "break-all")}${etherscanLinkHtml(etherscanUrl)}</div>`;
                } else {
                    detailsHtml += `<div class="font-bold">${escapeHtml(d.value)}</div>`;
                }
@@ -192,7 +243,12 @@ async function loadCalldata(txHash, toAddress) {
        // Bind copy handlers for new elements (including raw data now outside section)
        const copyTargets = [section, rawSection].filter(Boolean);
        for (const container of copyTargets) {
-            attachCopyHandlers(container);
+            container.querySelectorAll("[data-copy]").forEach((el) => {
+                el.onclick = () => {
+                    navigator.clipboard.writeText(el.dataset.copy);
+                    showFlash("Copied!");
+                };
+            });
        }
    } catch (e) {
        log.errorf("loadCalldata failed:", e.message);
--- a/src/popup/views/txStatus.js
+++ b/src/popup/views/txStatus.js
@@ -3,18 +3,23 @@
 const {
    $,
    showView,
+    showFlash,
+    addressDotHtml,
    addressTitle,
    escapeHtml,
-    renderAddressHtml,
-    attachCopyHandlers,
-    copyableHtml,
-    etherscanLinkHtml,
 } = require("./helpers");
 const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
 const { state, saveState } = require("../../shared/state");
 const { getProvider } = require("../../shared/balances");
 const { log } = require("../../shared/log");

+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
 let ctx;
 let elapsedTimer = null;
 let pollTimer = null;
@@ -31,19 +36,39 @@ function clearTimers() {
 }

 function toAddressHtml(address) {
+    const dot = addressDotHtml(address);
+    const link = `https://etherscan.io/address/${address}`;
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    const title = addressTitle(address, state.wallets);
-    return renderAddressHtml(address, { title });
+    if (title) {
+        return (
+            `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>` +
+            `<div class="break-all underline decoration-dashed cursor-pointer" data-copy="${escapeHtml(address)}">${escapeHtml(address)}</div>` +
+            extLink
+        );
+    }
+    return `<div class="flex items-center">${dot}<span class="break-all underline decoration-dashed cursor-pointer" data-copy="${escapeHtml(address)}">${escapeHtml(address)}</span>${extLink}</div>`;
 }

 function txHashHtml(hash) {
    const link = `https://etherscan.io/tx/${hash}`;
-    return copyableHtml(hash, "break-all") + etherscanLinkHtml(link);
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+    return (
+        `<span class="underline decoration-dashed cursor-pointer break-all" data-copy="${escapeHtml(hash)}">${escapeHtml(hash)}</span>` +
+        extLink
+    );
 }

-function blockNumberHtml(blockNumber) {
-    const num = String(blockNumber);
-    const link = `https://etherscan.io/block/${num}`;
-    return copyableHtml(num) + etherscanLinkHtml(link);
+function attachCopyHandlers(viewId) {
+    document
+        .getElementById(viewId)
+        .querySelectorAll("[data-copy]")
+        .forEach((el) => {
+            el.onclick = () => {
+                navigator.clipboard.writeText(el.dataset.copy);
+                showFlash("Copied!");
+            };
+        });
 }

 function showWait(txInfo, txHash) {
@@ -164,7 +189,7 @@ function renderSuccess() {
        $("success-tx-to").innerHTML = toAddressHtml(d.to);
    }

-    $("success-tx-block").innerHTML = blockNumberHtml(d.blockNumber);
+    $("success-tx-block").textContent = String(d.blockNumber);
    $("success-tx-hash").innerHTML = txHashHtml(d.hash);

    // Show decoded calldata details if present
--- a/src/shared/state.js
+++ b/src/shared/state.js
@@ -23,10 +23,8 @@ const DEFAULT_STATE = {
    hideFraudContracts: true,
    hideDustTransactions: true,
    dustThresholdGwei: 100000,
-    utcTimestamps: false,
    fraudContracts: [],
    tokenHolderCache: {},
-    theme: "system",
 };

 const state = {
@@ -55,10 +53,8 @@ async function saveState() {
        hideFraudContracts: state.hideFraudContracts,
        hideDustTransactions: state.hideDustTransactions,
        dustThresholdGwei: state.dustThresholdGwei,
-        utcTimestamps: state.utcTimestamps,
        fraudContracts: state.fraudContracts,
        tokenHolderCache: state.tokenHolderCache,
-        theme: state.theme,
        currentView: state.currentView,
        selectedWallet: state.selectedWallet,
        selectedAddress: state.selectedAddress,
@@ -112,11 +108,8 @@ async function loadState() {
            saved.dustThresholdGwei !== undefined
                ? saved.dustThresholdGwei
                : 100000;
-        state.utcTimestamps =
-            saved.utcTimestamps !== undefined ? saved.utcTimestamps : false;
        state.fraudContracts = saved.fraudContracts || [];
        state.tokenHolderCache = saved.tokenHolderCache || {};
-        state.theme = saved.theme || "system";
        state.currentView = saved.currentView || null;
        state.selectedWallet =
            saved.selectedWallet !== undefined ? saved.selectedWallet : null;
--- a/src/shared/transactions.js
+++ b/src/shared/transactions.js
@@ -251,4 +251,36 @@ function filterTransactions(txs, filters = {}) {
    return { transactions: filtered, newFraudContracts: newFraud };
 }

-module.exports = { fetchRecentTransactions, filterTransactions };
+async function hasTransactionHistory(address, blockscoutUrl) {
+    try {
+        const resp = await debugFetch(blockscoutUrl + "/addresses/" + address);
+        if (!resp.ok) {
+            // If Blockscout returns 404, the address has never been seen on-chain.
+            if (resp.status === 404) return false;
+            log.errorf(
+                "blockscout address check:",
+                resp.status,
+                resp.statusText,
+            );
+            return null; // unknown
+        }
+        const data = await resp.json();
+        // Blockscout v2 address endpoint returns tx counts.
+        // An address with no history may still exist (e.g. received ETH once
+        // but shows 0 outgoing). We check both transactions_count and
+        // token_transfers_count to be thorough.
+        const txCount =
+            (parseInt(data.transactions_count, 10) || 0) +
+            (parseInt(data.token_transfers_count, 10) || 0);
+        return txCount > 0;
+    } catch (e) {
+        log.errorf("hasTransactionHistory error:", e.message);
+        return null; // unknown, don't block the user
+    }
+}
+
+module.exports = {
+    fetchRecentTransactions,
+    filterTransactions,
+    hasTransactionHistory,
+};
--- a/src/shared/wallet.js
+++ b/src/shared/wallet.js
@@ -24,26 +24,6 @@ function hdWalletFromMnemonic(mnemonic) {
    return { xpub, firstAddress };
 }

-function hdWalletFromXprv(xprv) {
-    const root = HDNodeWallet.fromExtendedKey(xprv);
-    if (!root.privateKey) {
-        throw new Error("Not an extended private key (xprv).");
-    }
-    const node = root.derivePath("44'/60'/0'/0");
-    const xpub = node.neuter().extendedKey;
-    const firstAddress = node.deriveChild(0).address;
-    return { xpub, firstAddress };
-}
-
-function isValidXprv(key) {
-    try {
-        const node = HDNodeWallet.fromExtendedKey(key);
-        return !!node.privateKey;
-    } catch {
-        return false;
-    }
-}
-
 function addressFromPrivateKey(key) {
    const w = new Wallet(key);
    return w.address;
@@ -58,11 +38,6 @@ function getSignerForAddress(walletData, addrIndex, decryptedSecret) {
        );
        return node.deriveChild(addrIndex);
    }
-    if (walletData.type === "xprv") {
-        const root = HDNodeWallet.fromExtendedKey(decryptedSecret);
-        const node = root.derivePath("44'/60'/0'/0");
-        return node.deriveChild(addrIndex);
-    }
    return new Wallet(decryptedSecret);
 }

@@ -74,8 +49,6 @@ module.exports = {
    generateMnemonic,
    deriveAddressFromXpub,
    hdWalletFromMnemonic,
-    hdWalletFromXprv,
-    isValidXprv,
    addressFromPrivateKey,
    getSignerForAddress,
    isValidMnemonic,