feat: expand confirm-tx warnings for contracts, burn addrs, scam list

- Expand scam address list from 7 to 652 addresses using MEW darklist
- Add contract address warning when sending directly to a smart contract
- Add null/burn address warning (0x0000...0000, 0xdead, etc.)
- All warnings use visibility:hidden/visible pattern (no layout shift)
- Scam and burn address checks are synchronous; contract check is async

closes #114

src/popup/index.html

@@ -107,8 +107,7 @@
                     </div>
                     <div
                         id="add-wallet-phrase-warning"
-                        class="text-xs mb-2 border border-border border-dashed p-2"
-                        style="visibility: hidden"
+                        class="text-xs mb-2 border border-border border-dashed p-2 hidden"
                     >
                         Write these words down and keep them safe. Anyone with
                         them can take your funds; if you lose them, your wallet
@@ -376,8 +375,7 @@
                 </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>
@@ -581,17 +579,13 @@
                     <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-warnings" class="mb-2 hidden"></div>
                 <div
                     id="confirm-recipient-warning"
                     class="mb-2"
@@ -632,8 +626,7 @@
                 </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>
@@ -646,7 +639,6 @@
                 <div
                     id="confirm-tx-password-error"
                     class="text-xs mb-2 min-h-[1.25rem]"
-                    style="visibility: hidden"
                 ></div>
                 <button
                     id="btn-confirm-send"
@@ -761,8 +753,7 @@
                 </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>
 
@@ -790,8 +781,7 @@
                 </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"
@@ -973,8 +963,7 @@
                 </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>
@@ -1049,8 +1038,7 @@
                     />
                     <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"
@@ -1176,8 +1164,7 @@
                 </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
@@ -1205,10 +1192,8 @@
 
                 <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;
@@ -1245,8 +1230,7 @@
                 </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

src/popup/styles/main.css

@@ -19,16 +19,3 @@ 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;
-}

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");
         }
     });
 

src/popup/views/addWallet.js

@@ -11,25 +11,6 @@ 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"];
@@ -71,7 +52,7 @@ function show() {
     $("import-xprv-key").value = "";
     $("add-wallet-password").value = "";
     $("add-wallet-password-confirm").value = "";
-    $("add-wallet-phrase-warning").style.visibility = "hidden";
+    $("add-wallet-phrase-warning").classList.add("hidden");
     switchMode("mnemonic");
     showView("add-wallet");
 }
@@ -116,18 +97,18 @@ async function importMnemonic(ctx) {
     const pw = validatePassword();
     if (!pw) return;
     const { xpub, firstAddress } = hdWalletFromMnemonic(mnemonic);
-    const xpubDup = findWalletByXpub(xpub);
-    if (xpubDup) {
+    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 (" + xpubDup.name + ").",
+            "This recovery phrase is already added (" + duplicate.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 = {
@@ -181,10 +162,15 @@ async function importPrivateKey(ctx) {
     }
     const pw = validatePassword();
     if (!pw) return;
-    const duplicate = findWalletByAddress(addr);
+    const duplicate = state.wallets.find(
+        (w) =>
+            w.type === "key" &&
+            w.addresses[0] &&
+            w.addresses[0].address.toLowerCase() === addr.toLowerCase(),
+    );
     if (duplicate) {
         showFlash(
-            "This address already exists in wallet (" + duplicate.name + ").",
+            "This private key is already added (" + duplicate.name + ").",
         );
         return;
     }
@@ -222,14 +208,14 @@ async function importXprvKey(ctx) {
         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 + ").");
+    const duplicate = state.wallets.find(
+        (w) =>
+            (w.type === "hd" || w.type === "xprv") &&
+            w.addresses[0] &&
+            w.addresses[0].address.toLowerCase() === firstAddress.toLowerCase(),
+    );
+    if (duplicate) {
+        showFlash("This key is already added (" + duplicate.name + ").");
         return;
     }
     const pw = validatePassword();
@@ -281,7 +267,7 @@ function init(ctx) {
     // 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

src/popup/views/addressDetail.js

@@ -2,7 +2,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     balanceLinesForAddress,
     addressDotHtml,
     addressTitle,
@@ -242,7 +241,6 @@ function init(_ctx) {
         if (addr) {
             navigator.clipboard.writeText(addr);
             showFlash("Copied!");
-            flashCopyFeedback($("address-full"));
         }
     });
 
@@ -312,8 +310,8 @@ function init(_ctx) {
         $("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";
+            $("export-privkey-flash").classList.remove("hidden");
         } finally {
             btn.disabled = false;
             btn.classList.remove("text-muted");
@@ -360,7 +358,6 @@ function init(_ctx) {
         if (key) {
             navigator.clipboard.writeText(key);
             showFlash("Copied!");
-            flashCopyFeedback($("export-privkey-value"));
         }
     });
 
@@ -369,7 +366,6 @@ function init(_ctx) {
         if (full) {
             navigator.clipboard.writeText(full);
             showFlash("Copied!");
-            flashCopyFeedback($("export-privkey-address"));
         }
     });
 

src/popup/views/addressToken.js

@@ -5,7 +5,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     addressDotHtml,
     addressTitle,
     escapeHtml,
@@ -318,7 +317,6 @@ function init(_ctx) {
         if (addr) {
             navigator.clipboard.writeText(addr);
             showFlash("Copied!");
-            flashCopyFeedback($("address-token-full"));
         }
     });
 
@@ -327,7 +325,6 @@ function init(_ctx) {
         if (copyEl) {
             navigator.clipboard.writeText(copyEl.dataset.copy);
             showFlash("Copied!");
-            flashCopyFeedback(copyEl);
         }
     });
 
@@ -376,7 +373,6 @@ function init(_ctx) {
             copyEl.addEventListener("click", () => {
                 navigator.clipboard.writeText(copyEl.dataset.copy);
                 showFlash("Copied!");
-                flashCopyFeedback(copyEl);
             });
         }
         updateSendBalance();

src/popup/views/approval.js

@@ -269,7 +269,7 @@ function showTxApproval(details) {
     }
 
     $("approve-tx-password").value = "";
-    hideError("approve-tx-error");
+    $("approve-tx-error").classList.add("hidden");
 
     showView("approve-tx");
 }
@@ -351,10 +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");
         }
     }
 

src/popup/views/confirmTx.js

@@ -15,7 +15,6 @@ const {
     hideError,
     showView,
     showFlash,
-    flashCopyFeedback,
     addressTitle,
     addressDotHtml,
     escapeHtml,
@@ -25,10 +24,7 @@ const { getSignerForAddress } = require("../../shared/wallet");
 const { decryptWithPassword } = require("../../shared/vault");
 const { formatUsd, getPrice } = require("../../shared/prices");
 const { getProvider } = require("../../shared/balances");
-const {
-    getLocalWarnings,
-    getFullWarnings,
-} = require("../../shared/addressWarnings");
+const { isScamAddress } = require("../../shared/scamlist");
 const { ERC20_ABI, isBurnAddress } = require("../../shared/constants");
 const { log } = require("../../shared/log");
 const makeBlockie = require("ethereum-blockies-base64");
@@ -121,7 +117,6 @@ function show(txInfo) {
             copyEl.onclick = () => {
                 navigator.clipboard.writeText(copyEl.dataset.copy);
                 showFlash("Copied!");
-                flashCopyFeedback(copyEl);
             };
         }
     } else {
@@ -170,23 +165,33 @@ function show(txInfo) {
         $("confirm-balance").textContent = valueWithUsd(bal + " ETH", balUsd);
     }
 
-    // Check for warnings (synchronous local checks)
-    const localWarnings = getLocalWarnings(txInfo.to, {
-        fromAddress: txInfo.from,
-    });
+    // Check for warnings (synchronous checks)
+    const warnings = [];
+    if (isScamAddress(txInfo.to)) {
+        warnings.push(
+            "This address is on a known scam/fraud list. Do not send funds to this address.",
+        );
+    }
+    if (isBurnAddress(txInfo.to)) {
+        warnings.push(
+            "This is a known null/burn address. Funds sent here are permanently destroyed and cannot be recovered.",
+        );
+    }
+    if (txInfo.to.toLowerCase() === txInfo.from.toLowerCase()) {
+        warnings.push("You are sending to your own address.");
+    }
 
     const warningsEl = $("confirm-warnings");
-    if (localWarnings.length > 0) {
-        warningsEl.innerHTML = localWarnings
+    if (warnings.length > 0) {
+        warningsEl.innerHTML = warnings
             .map(
                 (w) =>
-                    `<div class="border border-border border-dashed p-2 mb-1 text-xs font-bold">WARNING: ${w.message}</div>`,
+                    `<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
@@ -224,12 +229,11 @@ 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");
     }
@@ -239,7 +243,7 @@ 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");
@@ -301,16 +305,15 @@ async function estimateGas(txInfo) {
 async function checkRecipientHistory(txInfo) {
     try {
         const provider = getProvider(state.rpcUrl);
-        const asyncWarnings = await getFullWarnings(txInfo.to, provider, {
-            fromAddress: txInfo.from,
-        });
-        for (const w of asyncWarnings) {
-            if (w.type === "contract") {
-                $("confirm-contract-warning").style.visibility = "visible";
-            }
-            if (w.type === "new-address") {
-                $("confirm-recipient-warning").style.visibility = "visible";
-            }
+        const code = await provider.getCode(txInfo.to);
+        if (code && code !== "0x") {
+            // Recipient is a contract — warn the user
+            $("confirm-contract-warning").style.visibility = "visible";
+            return;
+        }
+        const txCount = await provider.getTransactionCount(txInfo.to);
+        if (txCount === 0) {
+            $("confirm-recipient-warning").style.visibility = "visible";
         }
     } catch (e) {
         log.errorf("recipient history check failed:", e.message);

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;

src/popup/views/helpers.js

@@ -40,13 +40,11 @@ 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) {
@@ -260,26 +258,12 @@ function timeAgo(timestamp) {
     return years + " year" + (years !== 1 ? "s" : "") + " ago";
 }
 
-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,

src/popup/views/home.js

@@ -2,7 +2,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     balanceLinesForAddress,
     isoDate,
     timeAgo,
@@ -86,10 +85,9 @@ function renderActiveAddress() {
         el.innerHTML =
             `<span class="underline decoration-dashed cursor-pointer" id="active-addr-copy">${dot}${escapeHtml(addr)}</span>` +
             `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
-        $("active-addr-copy").addEventListener("click", (e) => {
+        $("active-addr-copy").addEventListener("click", () => {
             navigator.clipboard.writeText(addr);
             showFlash("Copied!");
-            flashCopyFeedback(e.currentTarget);
         });
     } else {
         el.textContent = "";

src/popup/views/receive.js

@@ -2,7 +2,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     formatAddressHtml,
     addressTitle,
 } = require("./helpers");
@@ -53,21 +52,19 @@ 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");
 }
 
 function init(ctx) {
-    $("receive-address-block").addEventListener("click", (e) => {
+    $("receive-address-block").addEventListener("click", () => {
         const addr = $("receive-address-block").dataset.full;
         if (addr) {
             navigator.clipboard.writeText(addr);
             showFlash("Copied!");
-            flashCopyFeedback(e.currentTarget);
         }
     });
 
@@ -76,7 +73,6 @@ function init(ctx) {
         if (addr) {
             navigator.clipboard.writeText(addr);
             showFlash("Copied!");
-            flashCopyFeedback($("receive-address-block"));
         }
     });
 

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");
         }
     });
 }

src/popup/views/transactionDetail.js

@@ -5,7 +5,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     addressDotHtml,
     addressTitle,
     escapeHtml,
@@ -172,7 +171,6 @@ function render() {
             el.onclick = () => {
                 navigator.clipboard.writeText(el.dataset.copy);
                 showFlash("Copied!");
-                flashCopyFeedback(el);
             };
         });
 }
@@ -250,7 +248,6 @@ async function loadCalldata(txHash, toAddress) {
                 el.onclick = () => {
                     navigator.clipboard.writeText(el.dataset.copy);
                     showFlash("Copied!");
-                    flashCopyFeedback(el);
                 };
             });
         }

src/popup/views/txStatus.js

@@ -4,7 +4,6 @@ const {
     $,
     showView,
     showFlash,
-    flashCopyFeedback,
     addressDotHtml,
     addressTitle,
     escapeHtml,
@@ -78,7 +77,6 @@ function attachCopyHandlers(viewId) {
             el.onclick = () => {
                 navigator.clipboard.writeText(el.dataset.copy);
                 showFlash("Copied!");
-                flashCopyFeedback(el);
             };
         });
 }

src/shared/addressWarnings.js

@@ -1,98 +0,0 @@
-// Address warning module.
-// Provides local and async (RPC-based) warning checks for Ethereum addresses.
-// Returns arrays of {type, message, severity} objects.
-
-const { isScamAddress } = require("./scamlist");
-const { isBurnAddress } = require("./constants");
-const { log } = require("./log");
-
-/**
- * Check an address against local-only lists (scam, burn, self-send).
- * Synchronous — no network calls.
- *
- * @param {string} address - The target address to check.
- * @param {object} [options] - Optional context.
- * @param {string} [options.fromAddress] - Sender address (for self-send check).
- * @returns {Array<{type: string, message: string, severity: string}>}
- */
-function getLocalWarnings(address, options = {}) {
-    const warnings = [];
-    const addr = address.toLowerCase();
-
-    if (isScamAddress(addr)) {
-        warnings.push({
-            type: "scam",
-            message:
-                "This address is on a known scam/fraud list. Do not send funds to this address.",
-            severity: "critical",
-        });
-    }
-
-    if (isBurnAddress(addr)) {
-        warnings.push({
-            type: "burn",
-            message:
-                "This is a known null/burn address. Funds sent here are permanently destroyed and cannot be recovered.",
-            severity: "critical",
-        });
-    }
-
-    if (options.fromAddress && addr === options.fromAddress.toLowerCase()) {
-        warnings.push({
-            type: "self-send",
-            message: "You are sending to your own address.",
-            severity: "warning",
-        });
-    }
-
-    return warnings;
-}
-
-/**
- * Check an address against local lists AND via RPC queries.
- * Async — performs network calls to check contract status and tx history.
- *
- * @param {string} address - The target address to check.
- * @param {object} provider - An ethers.js provider instance.
- * @param {object} [options] - Optional context.
- * @param {string} [options.fromAddress] - Sender address (for self-send check).
- * @returns {Promise<Array<{type: string, message: string, severity: string}>>}
- */
-async function getFullWarnings(address, provider, options = {}) {
-    const warnings = getLocalWarnings(address, options);
-
-    try {
-        const code = await provider.getCode(address);
-        if (code && code !== "0x") {
-            warnings.push({
-                type: "contract",
-                message:
-                    "This address is a smart contract, not a regular wallet.",
-                severity: "warning",
-            });
-            // If it's a contract, skip the tx count check — contracts
-            // may legitimately have zero inbound EOA transactions.
-            return warnings;
-        }
-    } catch (e) {
-        log.errorf("contract check failed:", e.message);
-    }
-
-    try {
-        const txCount = await provider.getTransactionCount(address);
-        if (txCount === 0) {
-            warnings.push({
-                type: "new-address",
-                message:
-                    "This address has never sent a transaction. Double-check it is correct.",
-                severity: "info",
-            });
-        }
-    } catch (e) {
-        log.errorf("tx count check failed:", e.message);
-    }
-
-    return warnings;
-}
-
-module.exports = { getLocalWarnings, getFullWarnings };