feat: add Etherscan label scraping and MetaMask phishing domain blocklist

- Add etherscanLabels module: scrapes Etherscan address pages for
  phishing/scam labels (Fake_Phishing*, Exploiter, scam warnings).
  Integrated as best-effort async check in addressWarnings.

- Add phishingDomains module: fetches MetaMask's eth-phishing-detect
  blocklist (~231K domains) at runtime, caches in memory, refreshes
  every 24h. Checks hostnames with subdomain matching and whitelist
  overrides.

- Integrate domain phishing checks into all approval flows:
  connection requests, transaction approvals, and signature requests
  show a prominent red warning banner when the requesting site is on
  the MetaMask blocklist.

- Add unit tests for both modules (12 tests for etherscanLabels
  parsing, 15 tests for phishingDomains matching).

Closes #114

src/background/index.js

@@ -12,6 +12,10 @@ const { refreshBalances, getProvider } = require("../shared/balances");
 const { debugFetch } = require("../shared/log");
 const { decryptWithPassword } = require("../shared/vault");
 const { getSignerForAddress } = require("../shared/wallet");
+const {
+    isPhishingDomain,
+    updatePhishingList,
+} = require("../shared/phishingDomains");
 
 const storageApi =
     typeof browser !== "undefined"
@@ -571,6 +575,10 @@ async function backgroundRefresh() {
 
 setInterval(backgroundRefresh, BACKGROUND_REFRESH_INTERVAL);
 
+// Fetch the MetaMask eth-phishing-detect domain blocklist on startup.
+// Refreshes every 24 hours automatically.
+updatePhishingList();
+
 // When approval window is closed without a response, treat as rejection
 if (windowsApi && windowsApi.onRemoved) {
     windowsApi.onRemoved.addListener((windowId) => {
@@ -643,6 +651,8 @@ runtime.onMessage.addListener((msg, sender, sendResponse) => {
                 resp.type = "sign";
                 resp.signParams = approval.signParams;
             }
+            // Flag if the requesting domain is on the phishing blocklist.
+            resp.isPhishingDomain = isPhishingDomain(approval.hostname);
             sendResponse(resp);
         } else {
             sendResponse(null);

src/popup/index.html

@@ -107,7 +107,8 @@
                     </div>
                     <div
                         id="add-wallet-phrase-warning"
-                        class="text-xs mb-2 border border-border border-dashed p-2 hidden"
+                        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
@@ -184,7 +185,7 @@
                 <!-- active address headline -->
                 <div
                     id="total-value"
-                    class="text-2xl font-bold min-h-[2rem]"
+                    class="text-2xl font-bold min-h-[2rem] text-fg"
                 ></div>
                 <div
                     id="total-value-sub"
@@ -375,7 +376,8 @@
                 </p>
                 <div
                     id="export-privkey-flash"
-                    class="text-xs mb-2 hidden"
+                    class="text-xs mb-2 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <div id="export-privkey-password-section" class="mb-2">
                     <label class="block mb-1">Password</label>
@@ -579,13 +581,17 @@
                     <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 hidden">
+                <div id="confirm-fee" class="mb-3" style="visibility: 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 hidden"></div>
+                <div
+                    id="confirm-warnings"
+                    class="mb-2"
+                    style="visibility: hidden"
+                ></div>
                 <div
                     id="confirm-recipient-warning"
                     class="mb-2"
@@ -599,9 +605,35 @@
                         Double-check the address before sending.
                     </div>
                 </div>
+                <div
+                    id="confirm-contract-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 is a smart contract. Sending ETH
+                        or tokens directly to a contract may result in permanent
+                        loss of funds.
+                    </div>
+                </div>
+                <div
+                    id="confirm-burn-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: This is a known null/burn address. Funds sent
+                        here are permanently destroyed and cannot be recovered.
+                    </div>
+                </div>
                 <div
                     id="confirm-errors"
-                    class="mb-2 border border-border border-dashed p-2 hidden"
+                    class="mb-2 border border-border border-dashed p-2"
+                    style="visibility: hidden; min-height: 1.25rem"
                 ></div>
                 <div class="mb-2">
                     <label class="block mb-1 text-xs">Password</label>
@@ -614,6 +646,7 @@
                 <div
                     id="confirm-tx-password-error"
                     class="text-xs mb-2 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <button
                     id="btn-confirm-send"
@@ -728,7 +761,8 @@
                 </button>
                 <div
                     id="receive-erc20-warning"
-                    class="text-xs border border-border border-dashed p-2 mt-3 hidden"
+                    class="text-xs border border-border border-dashed p-2 mt-3"
+                    style="visibility: hidden"
                 ></div>
             </div>
 
@@ -756,7 +790,8 @@
                 </div>
                 <div
                     id="add-token-info"
-                    class="text-xs text-muted mb-2 hidden"
+                    class="text-xs text-muted mb-2 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <div class="mb-2">
                     <label class="block mb-1 text-xs text-muted"
@@ -814,7 +849,7 @@
                 <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"
+                        class="text-xs flex items-center gap-1 cursor-pointer mb-2"
                     >
                         <input
                             type="checkbox"
@@ -822,6 +857,17 @@
                         />
                         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">
@@ -903,6 +949,12 @@
                         />
                         <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">
@@ -938,7 +990,8 @@
                 </p>
                 <div
                     id="delete-wallet-flash"
-                    class="text-xs text-red-500 mb-2 hidden"
+                    class="text-xs text-red-500 mb-2 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <div class="mb-2">
                     <label class="block mb-1">Password</label>
@@ -1013,7 +1066,8 @@
                     />
                     <div
                         id="settings-addtoken-info"
-                        class="text-xs text-muted mt-1 hidden"
+                        class="text-xs text-muted mt-1 min-h-[1.25rem]"
+                        style="visibility: hidden"
                     ></div>
                     <button
                         id="btn-settings-addtoken-manual"
@@ -1095,6 +1149,20 @@
             <!-- ============ TRANSACTION APPROVAL ============ -->
             <div id="view-approve-tx" class="view hidden">
                 <h2 class="font-bold mb-2">Transaction Request</h2>
+                <div
+                    id="approve-tx-phishing-warning"
+                    class="mb-3 p-2 text-xs font-bold hidden"
+                    style="
+                        background: #fee2e2;
+                        color: #991b1b;
+                        border: 2px solid #dc2626;
+                        border-radius: 6px;
+                    "
+                >
+                    ⚠️ PHISHING WARNING: This site is on MetaMask's phishing
+                    blocklist. This transaction may steal your funds. Proceed
+                    with extreme caution.
+                </div>
                 <p class="mb-2">
                     <span id="approve-tx-hostname" class="font-bold"></span>
                     wants to send a transaction.
@@ -1139,7 +1207,8 @@
                 </div>
                 <div
                     id="approve-tx-error"
-                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem] hidden"
+                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <div class="flex justify-between">
                     <button
@@ -1160,6 +1229,20 @@
             <!-- ============ SIGNATURE APPROVAL ============ -->
             <div id="view-approve-sign" class="view hidden">
                 <h2 class="font-bold mb-2">Signature Request</h2>
+                <div
+                    id="approve-sign-phishing-warning"
+                    class="mb-3 p-2 text-xs font-bold hidden"
+                    style="
+                        background: #fee2e2;
+                        color: #991b1b;
+                        border: 2px solid #dc2626;
+                        border-radius: 6px;
+                    "
+                >
+                    ⚠️ PHISHING WARNING: This site is on MetaMask's phishing
+                    blocklist. Signing this message may authorize theft of your
+                    funds. Proceed with extreme caution.
+                </div>
                 <p class="mb-2">
                     <span id="approve-sign-hostname" class="font-bold"></span>
                     wants you to sign a message.
@@ -1167,8 +1250,10 @@
 
                 <div
                     id="approve-sign-danger-warning"
-                    class="hidden mb-3 p-2 text-xs font-bold"
+                    class="mb-3 p-2 text-xs font-bold"
                     style="
+                        visibility: hidden;
+                        min-height: 1.25rem;
                         background: #fee2e2;
                         color: #991b1b;
                         border: 2px solid #dc2626;
@@ -1205,7 +1290,8 @@
                 </div>
                 <div
                     id="approve-sign-error"
-                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem] hidden"
+                    class="text-xs mb-2 border border-border border-dashed p-1 min-h-[1.25rem]"
+                    style="visibility: hidden"
                 ></div>
                 <div class="flex justify-between">
                     <button
@@ -1226,6 +1312,20 @@
             <!-- ============ SITE APPROVAL ============ -->
             <div id="view-approve-site" class="view hidden">
                 <h2 class="font-bold mb-2">Connection Request</h2>
+                <div
+                    id="approve-site-phishing-warning"
+                    class="mb-3 p-2 text-xs font-bold hidden"
+                    style="
+                        background: #fee2e2;
+                        color: #991b1b;
+                        border: 2px solid #dc2626;
+                        border-radius: 6px;
+                    "
+                >
+                    ⚠️ PHISHING WARNING: This site is on MetaMask's phishing
+                    blocklist. Connecting your wallet may result in loss of
+                    funds. Proceed with extreme caution.
+                </div>
                 <div class="mb-3">
                     <p class="mb-2">
                         <span id="approve-hostname" class="font-bold"></span>

src/popup/index.js

@@ -6,6 +6,7 @@ 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");
@@ -176,6 +177,7 @@ async function init() {
     }
 
     await loadState();
+    applyTheme(state.theme);
 
     // Auto-default active address
     if (

src/popup/styles/main.css

@@ -15,6 +15,18 @@
     --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;
@@ -29,6 +41,6 @@ body {
 
 .copy-flash-fade {
     transition:
-        background-color 300ms ease-out,
-        color 300ms ease-out;
+        background-color 225ms ease-out,
+        color 225ms ease-out;
 }

src/popup/theme.js

@@ -0,0 +1,33 @@
+// 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 };

src/popup/views/addToken.js

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

src/popup/views/addWallet.js

@@ -71,7 +71,7 @@ function show() {
     $("import-xprv-key").value = "";
     $("add-wallet-password").value = "";
     $("add-wallet-password-confirm").value = "";
-    $("add-wallet-phrase-warning").classList.add("hidden");
+    $("add-wallet-phrase-warning").style.visibility = "hidden";
     switchMode("mnemonic");
     showView("add-wallet");
 }
@@ -281,7 +281,7 @@ function init(ctx) {
     // Generate mnemonic
     $("btn-generate-phrase").addEventListener("click", () => {
         $("wallet-mnemonic").value = generateMnemonic();
-        $("add-wallet-phrase-warning").classList.remove("hidden");
+        $("add-wallet-phrase-warning").style.visibility = "visible";
     });
 
     // Import / confirm

src/popup/views/addressDetail.js

@@ -95,23 +95,39 @@ function show() {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
-    const off = -d.getTimezoneOffset();
-    const sign = off >= 0 ? "+" : "-";
-    const absOff = Math.abs(off);
-    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
+    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()) +
-        tz
+        tzStr
     );
 }
 
@@ -317,8 +333,8 @@ 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 = "";
@@ -329,7 +345,7 @@ function init(_ctx) {
         const password = $("export-privkey-password").value;
         if (!password) {
             $("export-privkey-flash").textContent = "Password is required.";
-            $("export-privkey-flash").classList.remove("hidden");
+            $("export-privkey-flash").style.visibility = "visible";
             return;
         }
         const btn = $("btn-export-privkey-confirm");
@@ -350,10 +366,10 @@ function init(_ctx) {
             $("export-privkey-password-section").classList.add("hidden");
             $("export-privkey-value").textContent = privateKey;
             $("export-privkey-result").classList.remove("hidden");
-            $("export-privkey-flash").classList.add("hidden");
+            $("export-privkey-flash").style.visibility = "hidden";
         } catch {
             $("export-privkey-flash").textContent = "Wrong password.";
-            $("export-privkey-flash").classList.remove("hidden");
+            $("export-privkey-flash").style.visibility = "visible";
         } finally {
             btn.disabled = false;
             btn.classList.remove("text-muted");

src/popup/views/addressToken.js

@@ -48,23 +48,39 @@ function etherscanAddressLink(address) {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
-    const off = -d.getTimezoneOffset();
-    const sign = off >= 0 ? "+" : "-";
-    const absOff = Math.abs(off);
-    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
+    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()) +
-        tz
+        tzStr
     );
 }
 

src/popup/views/approval.js

@@ -13,6 +13,7 @@ const { ERC20_ABI } = require("../../shared/constants");
 const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
 const txStatus = require("./txStatus");
 const uniswap = require("../../shared/uniswap");
+const { isPhishingDomain } = require("../../shared/phishingDomains");
 
 const runtime =
     typeof browser !== "undefined" ? browser.runtime : chrome.runtime;
@@ -155,7 +156,24 @@ function decodeCalldata(data, toAddress) {
     return null;
 }
 
+function showPhishingWarning(elementId, hostname, isPhishing) {
+    const el = $(elementId);
+    if (!el) return;
+    // Check both the flag from background and a local re-check
+    if (isPhishing || isPhishingDomain(hostname)) {
+        el.classList.remove("hidden");
+    } else {
+        el.classList.add("hidden");
+    }
+}
+
 function showTxApproval(details) {
+    showPhishingWarning(
+        "approve-tx-phishing-warning",
+        details.hostname,
+        details.isPhishingDomain,
+    );
+
     const toAddr = details.txParams.to;
     const token = toAddr ? TOKEN_BY_ADDRESS.get(toAddr.toLowerCase()) : null;
     const ethValue = formatEther(details.txParams.value || "0");
@@ -269,7 +287,7 @@ function showTxApproval(details) {
     }
 
     $("approve-tx-password").value = "";
-    $("approve-tx-error").classList.add("hidden");
+    hideError("approve-tx-error");
 
     showView("approve-tx");
 }
@@ -323,6 +341,12 @@ function formatTypedDataHtml(jsonStr) {
 }
 
 function showSignApproval(details) {
+    showPhishingWarning(
+        "approve-sign-phishing-warning",
+        details.hostname,
+        details.isPhishingDomain,
+    );
+
     const sp = details.signParams;
 
     $("approve-sign-hostname").textContent = details.hostname;
@@ -351,10 +375,10 @@ function showSignApproval(details) {
     if (warningEl) {
         if (sp.dangerWarning) {
             warningEl.textContent = sp.dangerWarning;
-            warningEl.classList.remove("hidden");
+            warningEl.style.visibility = "visible";
         } else {
             warningEl.textContent = "";
-            warningEl.classList.add("hidden");
+            warningEl.style.visibility = "hidden";
         }
     }
 
@@ -382,6 +406,12 @@ function show(id) {
             showSignApproval(details);
             return;
         }
+        // Site connection approval
+        showPhishingWarning(
+            "approve-site-phishing-warning",
+            details.hostname,
+            details.isPhishingDomain,
+        );
         $("approve-hostname").textContent = details.hostname;
         $("approve-address").innerHTML = approvalAddressHtml(
             state.activeAddress,

src/popup/views/confirmTx.js

@@ -25,8 +25,11 @@ const { getSignerForAddress } = require("../../shared/wallet");
 const { decryptWithPassword } = require("../../shared/vault");
 const { formatUsd, getPrice } = require("../../shared/prices");
 const { getProvider } = require("../../shared/balances");
-const { isScamAddress } = require("../../shared/scamlist");
-const { ERC20_ABI } = require("../../shared/constants");
+const {
+    getLocalWarnings,
+    getFullWarnings,
+} = require("../../shared/addressWarnings");
+const { ERC20_ABI, isBurnAddress } = require("../../shared/constants");
 const { log } = require("../../shared/log");
 const makeBlockie = require("ethereum-blockies-base64");
 const txStatus = require("./txStatus");
@@ -167,28 +170,23 @@ function show(txInfo) {
         $("confirm-balance").textContent = valueWithUsd(bal + " ETH", balUsd);
     }
 
-    // Check for warnings
-    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 (txInfo.to.toLowerCase() === txInfo.from.toLowerCase()) {
-        warnings.push("You are sending to your own address.");
-    }
+    // Check for warnings (synchronous local checks)
+    const localWarnings = getLocalWarnings(txInfo.to, {
+        fromAddress: txInfo.from,
+    });
 
     const warningsEl = $("confirm-warnings");
-    if (warnings.length > 0) {
-        warningsEl.innerHTML = warnings
+    if (localWarnings.length > 0) {
+        warningsEl.innerHTML = localWarnings
             .map(
                 (w) =>
-                    `<div class="border border-border border-dashed p-2 mb-1 text-xs font-bold">WARNING: ${w}</div>`,
+                    `<div class="border border-border border-dashed p-2 mb-1 text-xs font-bold">WARNING: ${w.message}</div>`,
             )
             .join("");
-        warningsEl.classList.remove("hidden");
+        warningsEl.style.visibility = "visible";
     } else {
-        warningsEl.classList.add("hidden");
+        warningsEl.innerHTML = "";
+        warningsEl.style.visibility = "hidden";
     }
 
     // Check for errors
@@ -226,11 +224,12 @@ function show(txInfo) {
         errorsEl.innerHTML = errors
             .map((e) => `<div class="text-xs">${e}</div>`)
             .join("");
-        errorsEl.classList.remove("hidden");
+        errorsEl.style.visibility = "visible";
         sendBtn.disabled = true;
         sendBtn.classList.add("text-muted");
     } else {
-        errorsEl.classList.add("hidden");
+        errorsEl.innerHTML = "";
+        errorsEl.style.visibility = "hidden";
         sendBtn.disabled = false;
         sendBtn.classList.remove("text-muted");
     }
@@ -240,13 +239,20 @@ function show(txInfo) {
     hideError("confirm-tx-password-error");
 
     // Gas estimate — show placeholder then fetch async
-    $("confirm-fee").classList.remove("hidden");
+    $("confirm-fee").style.visibility = "visible";
     $("confirm-fee-amount").textContent = "Estimating...";
     state.viewData = { pendingTx: txInfo };
     showView("confirm-tx");
 
-    // Reset recipient warning to hidden (space always reserved, no layout shift)
+    // Reset async warnings to hidden (space always reserved, no layout shift)
     $("confirm-recipient-warning").style.visibility = "hidden";
+    $("confirm-contract-warning").style.visibility = "hidden";
+    $("confirm-burn-warning").style.visibility = "hidden";
+
+    // Show burn warning via reserved element (in addition to inline warning)
+    if (isBurnAddress(txInfo.to)) {
+        $("confirm-burn-warning").style.visibility = "visible";
+    }
 
     estimateGas(txInfo);
     checkRecipientHistory(txInfo);
@@ -293,19 +299,18 @@ 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 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";
+            }
         }
     } 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").classList.add("hidden");
+    $("delete-wallet-flash").style.visibility = "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").classList.remove("hidden");
+            $("delete-wallet-flash").style.visibility = "visible";
             return;
         }
 
         if (deleteWalletIndex === null) {
             $("delete-wallet-flash").textContent =
                 "No wallet selected for deletion.";
-            $("delete-wallet-flash").classList.remove("hidden");
+            $("delete-wallet-flash").style.visibility = "visible";
             return;
         }
 
@@ -52,7 +52,7 @@ function init(_ctx) {
             await decryptWithPassword(wallet.encryptedSecret, pw);
         } catch (_e) {
             $("delete-wallet-flash").textContent = "Wrong password.";
-            $("delete-wallet-flash").classList.remove("hidden");
+            $("delete-wallet-flash").style.visibility = "visible";
             btn.disabled = false;
             btn.classList.remove("text-muted");
             return;

src/popup/views/helpers.js

@@ -40,11 +40,13 @@ function $(id) {
 function showError(id, msg) {
     const el = $(id);
     el.textContent = msg;
-    el.classList.remove("hidden");
+    el.style.visibility = "visible";
 }
 
 function hideError(id) {
-    $(id).classList.add("hidden");
+    const el = $(id);
+    el.textContent = "";
+    el.style.visibility = "hidden";
 }
 
 function showView(name) {
@@ -226,23 +228,39 @@ function formatAddressHtml(address, ensName, maxLen, title) {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
-    const off = -d.getTimezoneOffset();
-    const sign = off >= 0 ? "+" : "-";
-    const absOff = Math.abs(off);
-    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
+    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()) +
-        tz
+        tzStr
     );
 }
 
@@ -272,8 +290,8 @@ function flashCopyFeedback(el) {
         el.classList.add("copy-flash-fade");
         setTimeout(() => {
             el.classList.remove("copy-flash-fade");
-        }, 350);
-    }, 100);
+        }, 275);
+    }, 75);
 }
 
 module.exports = {

src/popup/views/receive.js

@@ -53,9 +53,10 @@ 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.classList.remove("hidden");
+        warningEl.style.visibility = "visible";
     } else {
-        warningEl.classList.add("hidden");
+        warningEl.textContent = "";
+        warningEl.style.visibility = "hidden";
     }
     showView("receive");
 }

src/popup/views/settings.js

@@ -1,4 +1,5 @@
 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");
@@ -214,6 +215,13 @@ 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;
@@ -241,6 +249,12 @@ 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(

src/popup/views/settingsAddToken.js

@@ -73,7 +73,8 @@ function renderDropdown() {
 
 function show() {
     $("settings-addtoken-address").value = "";
-    $("settings-addtoken-info").classList.add("hidden");
+    $("settings-addtoken-info").textContent = "";
+    $("settings-addtoken-info").style.visibility = "hidden";
     renderTop10();
     renderDropdown();
     showView("settings-addtoken");
@@ -129,7 +130,7 @@ function init(_ctx) {
         }
         const infoEl = $("settings-addtoken-info");
         infoEl.textContent = "Looking up token...";
-        infoEl.classList.remove("hidden");
+        infoEl.style.visibility = "visible";
         log.debugf("Looking up token contract", addr);
         try {
             const info = await lookupTokenInfo(addr, state.rpcUrl);
@@ -143,7 +144,8 @@ function init(_ctx) {
             await saveState();
             showFlash("Added " + info.symbol);
             $("settings-addtoken-address").value = "";
-            infoEl.classList.add("hidden");
+            infoEl.textContent = "";
+            infoEl.style.visibility = "hidden";
             renderTop10();
             renderDropdown();
             ctx.doRefreshAndRender();
@@ -151,7 +153,8 @@ function init(_ctx) {
             const detail = e.shortMessage || e.message || String(e);
             log.errorf("Token lookup failed for", addr, detail);
             showFlash(detail);
-            infoEl.classList.add("hidden");
+            infoEl.textContent = "";
+            infoEl.style.visibility = "hidden";
         }
     });
 }

src/shared/addressWarnings.js

@@ -0,0 +1,109 @@
+// 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 { checkEtherscanLabel } = require("./etherscanLabels");
+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);
+    }
+
+    // Etherscan label check (best-effort async — network failures are silent).
+    try {
+        const etherscanWarning = await checkEtherscanLabel(address);
+        if (etherscanWarning) {
+            warnings.push(etherscanWarning);
+        }
+    } catch (e) {
+        log.errorf("etherscan label check failed:", e.message);
+    }
+
+    return warnings;
+}
+
+module.exports = { getLocalWarnings, getFullWarnings };

src/shared/constants.js

@@ -20,6 +20,19 @@ const ERC20_ABI = [
     "function approve(address spender, uint256 amount) returns (bool)",
 ];
 
+// Known null/burn addresses that permanently destroy funds.
+const BURN_ADDRESSES = new Set([
+    "0x0000000000000000000000000000000000000000",
+    "0x0000000000000000000000000000000000000001",
+    "0x000000000000000000000000000000000000dead",
+    "0xdead000000000000000000000000000000000000",
+    "0x00000000000000000000000000000000deadbeef",
+]);
+
+function isBurnAddress(address) {
+    return BURN_ADDRESSES.has(address.toLowerCase());
+}
+
 module.exports = {
     DEBUG,
     DEBUG_MNEMONIC,
@@ -28,4 +41,6 @@ module.exports = {
     DEFAULT_BLOCKSCOUT_URL,
     BIP44_ETH_PATH,
     ERC20_ABI,
+    BURN_ADDRESSES,
+    isBurnAddress,
 };

src/shared/etherscanLabels.js

@@ -0,0 +1,102 @@
+// Etherscan address label lookup via page scraping.
+// Extension users make the requests directly to Etherscan — no proxy needed.
+// This is a best-effort enrichment: network failures return null silently.
+
+const ETHERSCAN_BASE = "https://etherscan.io/address/";
+
+// Patterns in the page title that indicate a flagged address.
+// Title format: "Fake_Phishing184810 | Address: 0x... | Etherscan"
+const PHISHING_LABEL_PATTERNS = [/^Fake_Phishing/i, /^Phish:/i, /^Exploiter/i];
+
+// Patterns in the page body that indicate a scam/phishing warning.
+const SCAM_BODY_PATTERNS = [
+    /used in a\s+(?:\w+\s+)?phishing scam/i,
+    /used in a\s+(?:\w+\s+)?scam/i,
+    /wallet\s+drainer/i,
+];
+
+/**
+ * Parse the Etherscan address page HTML to extract label info.
+ * Exported for unit testing (no fetch needed).
+ *
+ * @param {string} html - Raw HTML of the Etherscan address page.
+ * @returns {{ label: string|null, isPhishing: boolean, warning: string|null }}
+ */
+function parseEtherscanPage(html) {
+    // Extract <title> content
+    const titleMatch = html.match(/<title[^>]*>([^<]+)<\/title>/i);
+    let label = null;
+    let isPhishing = false;
+    let warning = null;
+
+    if (titleMatch) {
+        const title = titleMatch[1].trim();
+        // Title: "LABEL | Address: 0x... | Etherscan" or "Address: 0x... | Etherscan"
+        const labelMatch = title.match(/^(.+?)\s*\|\s*Address:/);
+        if (labelMatch) {
+            const candidate = labelMatch[1].trim();
+            // Only treat as a label if it's not just "Address" (unlabeled addresses)
+            if (candidate.toLowerCase() !== "address") {
+                label = candidate;
+            }
+        }
+    }
+
+    // Check label against phishing patterns
+    if (label) {
+        for (const pat of PHISHING_LABEL_PATTERNS) {
+            if (pat.test(label)) {
+                isPhishing = true;
+                warning = `Etherscan labels this address as "${label}" (Phish/Hack).`;
+                break;
+            }
+        }
+    }
+
+    // Check page body for scam warning banners
+    if (!isPhishing) {
+        for (const pat of SCAM_BODY_PATTERNS) {
+            if (pat.test(html)) {
+                isPhishing = true;
+                warning = label
+                    ? `Etherscan labels this address as "${label}" and reports it was used in a scam.`
+                    : "Etherscan reports this address was flagged for phishing/scam activity.";
+                break;
+            }
+        }
+    }
+
+    return { label, isPhishing, warning };
+}
+
+/**
+ * Fetch an address page from Etherscan and check for scam/phishing labels.
+ * Returns a warning object if the address is flagged, or null.
+ * Network failures return null silently (best-effort check).
+ *
+ * @param {string} address - Ethereum address to check.
+ * @returns {Promise<{type: string, message: string, severity: string}|null>}
+ */
+async function checkEtherscanLabel(address) {
+    try {
+        const resp = await fetch(ETHERSCAN_BASE + address, {
+            headers: { Accept: "text/html" },
+        });
+        if (!resp.ok) return null;
+        const html = await resp.text();
+        const result = parseEtherscanPage(html);
+        if (result.isPhishing) {
+            return {
+                type: "etherscan-phishing",
+                message: result.warning,
+                severity: "critical",
+            };
+        }
+        return null;
+    } catch {
+        // Network errors are expected — Etherscan may rate-limit or block.
+        return null;
+    }
+}
+
+module.exports = { parseEtherscanPage, checkEtherscanLabel };

src/shared/phishingDomains.js

@@ -0,0 +1,133 @@
+// Domain-based phishing detection using MetaMask's eth-phishing-detect blocklist.
+// Fetches the blocklist at runtime, caches it in memory, and checks hostnames.
+//
+// The blocklist source:
+// https://github.com/MetaMask/eth-phishing-detect  (src/config.json)
+//
+// The config uses { blacklist: [...], whitelist: [...], fuzzylist: [...] }.
+// We check exact hostname and parent-domain matches against the blacklist,
+// with whitelist overrides.
+
+const BLOCKLIST_URL =
+    "https://raw.githubusercontent.com/MetaMask/eth-phishing-detect/main/src/config.json";
+
+const CACHE_TTL_MS = 24 * 60 * 60 * 1000; // 24 hours
+
+let blacklistSet = new Set();
+let whitelistSet = new Set();
+let lastFetchTime = 0;
+let fetchPromise = null;
+
+/**
+ * Load a pre-parsed config into the in-memory sets.
+ * Used for testing and for loading from cache.
+ *
+ * @param {{ blacklist?: string[], whitelist?: string[] }} config
+ */
+function loadConfig(config) {
+    blacklistSet = new Set(
+        (config.blacklist || []).map((d) => d.toLowerCase()),
+    );
+    whitelistSet = new Set(
+        (config.whitelist || []).map((d) => d.toLowerCase()),
+    );
+    lastFetchTime = Date.now();
+}
+
+/**
+ * Generate hostname variants for subdomain matching.
+ * "sub.evil.com" yields ["sub.evil.com", "evil.com"].
+ *
+ * @param {string} hostname
+ * @returns {string[]}
+ */
+function hostnameVariants(hostname) {
+    const h = hostname.toLowerCase();
+    const variants = [h];
+    const parts = h.split(".");
+    // Parent domains: a.b.c.d -> b.c.d, c.d
+    for (let i = 1; i < parts.length - 1; i++) {
+        variants.push(parts.slice(i).join("."));
+    }
+    return variants;
+}
+
+/**
+ * Check if a hostname is on the phishing blocklist.
+ * Checks exact hostname and all parent domains.
+ * Whitelisted domains are never flagged.
+ *
+ * @param {string} hostname - The hostname to check.
+ * @returns {boolean}
+ */
+function isPhishingDomain(hostname) {
+    if (!hostname) return false;
+    const variants = hostnameVariants(hostname);
+    // Whitelist takes priority
+    for (const v of variants) {
+        if (whitelistSet.has(v)) return false;
+    }
+    for (const v of variants) {
+        if (blacklistSet.has(v)) return true;
+    }
+    return false;
+}
+
+/**
+ * Fetch the latest blocklist from the MetaMask repo.
+ * De-duplicates concurrent fetches. Results are cached for CACHE_TTL_MS.
+ *
+ * @returns {Promise<void>}
+ */
+async function updatePhishingList() {
+    // Skip if recently fetched
+    if (Date.now() - lastFetchTime < CACHE_TTL_MS && blacklistSet.size > 0) {
+        return;
+    }
+
+    // De-duplicate concurrent calls
+    if (fetchPromise) return fetchPromise;
+
+    fetchPromise = (async () => {
+        try {
+            const resp = await fetch(BLOCKLIST_URL);
+            if (!resp.ok) throw new Error("HTTP " + resp.status);
+            const config = await resp.json();
+            loadConfig(config);
+        } catch {
+            // Silently fail — we'll retry next time.
+        } finally {
+            fetchPromise = null;
+        }
+    })();
+
+    return fetchPromise;
+}
+
+/**
+ * Return the current blocklist size (for diagnostics).
+ *
+ * @returns {number}
+ */
+function getBlocklistSize() {
+    return blacklistSet.size;
+}
+
+/**
+ * Reset internal state (for testing).
+ */
+function _reset() {
+    blacklistSet = new Set();
+    whitelistSet = new Set();
+    lastFetchTime = 0;
+    fetchPromise = null;
+}
+
+module.exports = {
+    isPhishingDomain,
+    updatePhishingList,
+    loadConfig,
+    getBlocklistSize,
+    hostnameVariants,
+    _reset,
+};

src/shared/state.js

@@ -23,8 +23,10 @@ const DEFAULT_STATE = {
     hideFraudContracts: true,
     hideDustTransactions: true,
     dustThresholdGwei: 100000,
+    utcTimestamps: false,
     fraudContracts: [],
     tokenHolderCache: {},
+    theme: "system",
 };
 
 const state = {
@@ -53,8 +55,10 @@ 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,
@@ -108,8 +112,11 @@ 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;

src/shared/uniswap.js

@@ -487,10 +487,7 @@ function decode(data, toAddress) {
         const deadlineDate = new Date(Number(deadline) * 1000);
         details.push({
             label: "Deadline",
-            value: deadlineDate
-                .toISOString()
-                .replace("T", " ")
-                .replace(".000Z", "Z"),
+            value: deadlineDate.toISOString().replace("T", " ").slice(0, 19),
         });
 
         return {

tests/etherscanLabels.test.js

@@ -0,0 +1,100 @@
+const { parseEtherscanPage } = require("../src/shared/etherscanLabels");
+
+describe("etherscanLabels", () => {
+    describe("parseEtherscanPage", () => {
+        test("detects Fake_Phishing label in title", () => {
+            const html = `<html><head><title>Fake_Phishing184810 | Address: 0x00000c07...3ea470000 | Etherscan</title></head><body></body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("Fake_Phishing184810");
+            expect(result.isPhishing).toBe(true);
+            expect(result.warning).toContain("Fake_Phishing184810");
+            expect(result.warning).toContain("Phish/Hack");
+        });
+
+        test("detects Fake_Phishing with different number", () => {
+            const html = `<html><head><title>Fake_Phishing5169 | Address: 0x3e0defb8...99a7a8a74 | Etherscan</title></head><body></body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("Fake_Phishing5169");
+            expect(result.isPhishing).toBe(true);
+        });
+
+        test("detects Exploiter label", () => {
+            const html = `<html><head><title>Exploiter 42 | Address: 0xabcdef...1234 | Etherscan</title></head><body></body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("Exploiter 42");
+            expect(result.isPhishing).toBe(true);
+        });
+
+        test("detects scam warning in body text", () => {
+            const html =
+                `<html><head><title>Address: 0xabcdef...1234 | Etherscan</title></head>` +
+                `<body>There are reports that this address was used in a Phishing scam.</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBeNull();
+            expect(result.isPhishing).toBe(true);
+            expect(result.warning).toContain("phishing/scam");
+        });
+
+        test("detects scam warning with label in body", () => {
+            const html =
+                `<html><head><title>SomeScammer | Address: 0xabcdef...1234 | Etherscan</title></head>` +
+                `<body>There are reports that this address was used in a scam.</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("SomeScammer");
+            expect(result.isPhishing).toBe(true);
+            expect(result.warning).toContain("SomeScammer");
+        });
+
+        test("returns clean result for legitimate address", () => {
+            const html = `<html><head><title>vitalik.eth | Address: 0xd8dA6BF2...37aA96045 | Etherscan</title></head><body>Overview</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("vitalik.eth");
+            expect(result.isPhishing).toBe(false);
+            expect(result.warning).toBeNull();
+        });
+
+        test("returns clean result for unlabeled address", () => {
+            const html = `<html><head><title>Address: 0x1234567890...abcdef | Etherscan</title></head><body>Overview</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBeNull();
+            expect(result.isPhishing).toBe(false);
+            expect(result.warning).toBeNull();
+        });
+
+        test("handles exchange labels correctly (not phishing)", () => {
+            const html = `<html><head><title>Coinbase 10 | Address: 0xa9d1e08c...b81d3e43 | Etherscan</title></head><body>Overview</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("Coinbase 10");
+            expect(result.isPhishing).toBe(false);
+        });
+
+        test("handles contract names correctly (not phishing)", () => {
+            const html = `<html><head><title>Beacon Deposit Contract | Address: 0x00000000...03d7705Fa | Etherscan</title></head><body>Overview</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBe("Beacon Deposit Contract");
+            expect(result.isPhishing).toBe(false);
+        });
+
+        test("handles empty HTML gracefully", () => {
+            const result = parseEtherscanPage("");
+            expect(result.label).toBeNull();
+            expect(result.isPhishing).toBe(false);
+            expect(result.warning).toBeNull();
+        });
+
+        test("handles malformed title tag", () => {
+            const html = `<html><head><title></title></head><body></body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.label).toBeNull();
+            expect(result.isPhishing).toBe(false);
+        });
+
+        test("detects wallet drainer warning", () => {
+            const html =
+                `<html><head><title>Address: 0xabc...def | Etherscan</title></head>` +
+                `<body>This is a known wallet drainer contract.</body></html>`;
+            const result = parseEtherscanPage(html);
+            expect(result.isPhishing).toBe(true);
+        });
+    });
+});

tests/phishingDomains.test.js

@@ -0,0 +1,166 @@
+const {
+    isPhishingDomain,
+    loadConfig,
+    getBlocklistSize,
+    hostnameVariants,
+    _reset,
+} = require("../src/shared/phishingDomains");
+
+// Reset state before each test to avoid cross-test contamination.
+beforeEach(() => {
+    _reset();
+});
+
+describe("phishingDomains", () => {
+    describe("hostnameVariants", () => {
+        test("returns exact hostname plus parent domains", () => {
+            const variants = hostnameVariants("sub.evil.com");
+            expect(variants).toEqual(["sub.evil.com", "evil.com"]);
+        });
+
+        test("returns just the hostname for a bare domain", () => {
+            const variants = hostnameVariants("example.com");
+            expect(variants).toEqual(["example.com"]);
+        });
+
+        test("handles deep subdomain chains", () => {
+            const variants = hostnameVariants("a.b.c.d.com");
+            expect(variants).toEqual([
+                "a.b.c.d.com",
+                "b.c.d.com",
+                "c.d.com",
+                "d.com",
+            ]);
+        });
+
+        test("lowercases hostnames", () => {
+            const variants = hostnameVariants("Evil.COM");
+            expect(variants).toEqual(["evil.com"]);
+        });
+    });
+
+    describe("loadConfig + isPhishingDomain", () => {
+        test("detects exact blacklisted domain", () => {
+            loadConfig({
+                blacklist: ["evil-phishing.com", "scam-swap.xyz"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("evil-phishing.com")).toBe(true);
+            expect(isPhishingDomain("scam-swap.xyz")).toBe(true);
+        });
+
+        test("returns false for clean domains", () => {
+            loadConfig({
+                blacklist: ["evil-phishing.com"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("etherscan.io")).toBe(false);
+            expect(isPhishingDomain("uniswap.org")).toBe(false);
+        });
+
+        test("detects subdomain of blacklisted domain", () => {
+            loadConfig({
+                blacklist: ["evil-phishing.com"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("app.evil-phishing.com")).toBe(true);
+            expect(isPhishingDomain("sub.app.evil-phishing.com")).toBe(true);
+        });
+
+        test("whitelist overrides blacklist", () => {
+            loadConfig({
+                blacklist: ["metamask.io"],
+                whitelist: ["metamask.io"],
+            });
+            expect(isPhishingDomain("metamask.io")).toBe(false);
+        });
+
+        test("whitelist on parent domain overrides blacklist", () => {
+            loadConfig({
+                blacklist: ["sub.legit.com"],
+                whitelist: ["legit.com"],
+            });
+            expect(isPhishingDomain("sub.legit.com")).toBe(false);
+        });
+
+        test("case-insensitive matching", () => {
+            loadConfig({
+                blacklist: ["Evil-Phishing.COM"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("evil-phishing.com")).toBe(true);
+            expect(isPhishingDomain("EVIL-PHISHING.COM")).toBe(true);
+        });
+
+        test("returns false for empty/null hostname", () => {
+            loadConfig({
+                blacklist: ["evil.com"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("")).toBe(false);
+            expect(isPhishingDomain(null)).toBe(false);
+        });
+
+        test("getBlocklistSize reflects loaded config", () => {
+            loadConfig({
+                blacklist: ["a.com", "b.com", "c.com"],
+                whitelist: ["d.com"],
+            });
+            expect(getBlocklistSize()).toBe(3);
+        });
+
+        test("handles config with no blacklist/whitelist keys", () => {
+            loadConfig({});
+            expect(isPhishingDomain("anything.com")).toBe(false);
+            expect(getBlocklistSize()).toBe(0);
+        });
+
+        test("re-loading config replaces previous data", () => {
+            loadConfig({
+                blacklist: ["old-scam.com"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("old-scam.com")).toBe(true);
+
+            loadConfig({
+                blacklist: ["new-scam.com"],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("old-scam.com")).toBe(false);
+            expect(isPhishingDomain("new-scam.com")).toBe(true);
+        });
+    });
+
+    describe("real-world MetaMask blocklist patterns", () => {
+        test("detects known phishing domains from MetaMask list", () => {
+            loadConfig({
+                blacklist: [
+                    "uniswap-trade.web.app",
+                    "hopprotocol.pro",
+                    "blast-pools.pages.dev",
+                ],
+                whitelist: [],
+            });
+            expect(isPhishingDomain("uniswap-trade.web.app")).toBe(true);
+            expect(isPhishingDomain("hopprotocol.pro")).toBe(true);
+            expect(isPhishingDomain("blast-pools.pages.dev")).toBe(true);
+        });
+
+        test("does not flag legitimate domains whitelisted by MetaMask", () => {
+            loadConfig({
+                blacklist: ["opensea.pro"],
+                whitelist: [
+                    "opensea.io",
+                    "metamask.io",
+                    "etherscan.io",
+                    "opensea.pro",
+                ],
+            });
+            expect(isPhishingDomain("opensea.io")).toBe(false);
+            expect(isPhishingDomain("metamask.io")).toBe(false);
+            expect(isPhishingDomain("etherscan.io")).toBe(false);
+            // opensea.pro is both blacklisted and whitelisted — whitelist wins
+            expect(isPhishingDomain("opensea.pro")).toBe(false);
+        });
+    });
+});