fix: unify address display with shared renderAddressHtml utility

All address rendering now uses a single renderAddressHtml() function in
helpers.js that produces consistent output everywhere:
- Color dot (deterministic from address)
- Full address with dashed-underline click-to-copy affordance
- Etherscan external link icon

Refactored all callsites across 9 view files:
- approval.js: approvalAddressHtml now delegates to renderAddressHtml,
  added attachCopyHandlers for click-to-copy on approve-tx/sign/site views
- confirmTx.js: confirmAddressHtml uses renderAddressHtml, token contract
  address uses renderAddressHtml with attachCopyHandlers
- txStatus.js: toAddressHtml delegates to renderAddressHtml
- transactionDetail.js: txAddressHtml delegates to renderAddressHtml,
  decoded calldata addresses use renderAddressHtml
- home.js: active address display uses renderAddressHtml
- send.js: from-address display uses renderAddressHtml
- receive.js: address block uses formatAddressHtml (which delegates to
  renderAddressHtml), removed separate etherscan link element
- addressDetail.js: address line uses renderAddressHtml, export-privkey
  address uses renderAddressHtml
- addressToken.js: address line and contract info use renderAddressHtml

Also consolidated:
- EXT_ICON SVG constant moved to helpers.js (removed 6 duplicates)
- copyableHtml() moved to helpers.js (removed duplicate in transactionDetail)
- etherscanLinkHtml() moved to helpers.js (removed duplicates)
- attachCopyHandlers() moved to helpers.js (removed duplicate in txStatus)
- Removed unused local functions (etherscanTokenLink, etherscanAddressLink)
- Cleaned up unused imports across all files

closes #97

src/background/index.js

@@ -2,16 +2,12 @@
 // Handles EIP-1193 RPC requests from content scripts and proxies
 // non-sensitive calls to the configured Ethereum JSON-RPC endpoint.
 
-const { DEFAULT_RPC_URL } = require("../shared/constants");
-const { SUPPORTED_CHAIN_IDS, networkByChainId } = require("../shared/networks");
-const { onChainSwitch } = require("../shared/chainSwitch");
-const { getBytes } = require("ethers");
 const {
-    state,
-    loadState,
-    saveState,
-    currentNetwork,
-} = require("../shared/state");
+    ETHEREUM_MAINNET_CHAIN_ID,
+    DEFAULT_RPC_URL,
+} = require("../shared/constants");
+const { getBytes } = require("ethers");
+const { state, loadState, saveState } = require("../shared/state");
 const { refreshBalances, getProvider } = require("../shared/balances");
 const { debugFetch } = require("../shared/log");
 const { decryptWithPassword } = require("../shared/vault");
@@ -333,43 +329,31 @@ async function handleRpc(method, params, origin) {
     }
 
     if (method === "eth_chainId") {
-        return { result: currentNetwork().chainId };
+        return { result: ETHEREUM_MAINNET_CHAIN_ID };
     }
 
     if (method === "net_version") {
-        return { result: currentNetwork().networkVersion };
+        return { result: "1" };
     }
 
     if (method === "wallet_switchEthereumChain") {
         const chainId = params?.[0]?.chainId;
-        if (chainId === currentNetwork().chainId) {
-            return { result: null };
-        }
-        if (SUPPORTED_CHAIN_IDS.has(chainId)) {
-            const target = networkByChainId(chainId);
-            await onChainSwitch(target.id);
-            broadcastChainChanged(target.chainId);
+        if (chainId === ETHEREUM_MAINNET_CHAIN_ID) {
             return { result: null };
         }
         return {
             error: {
                 code: 4902,
-                message:
-                    "AutistMask supports Ethereum Mainnet and Sepolia Testnet only.",
+                message: "AutistMask only supports Ethereum mainnet.",
             },
         };
     }
 
     if (method === "wallet_addEthereumChain") {
-        const chainId = params?.[0]?.chainId;
-        if (SUPPORTED_CHAIN_IDS.has(chainId)) {
-            return { result: null };
-        }
         return {
             error: {
                 code: 4902,
-                message:
-                    "AutistMask supports Ethereum Mainnet and Sepolia Testnet only.",
+                message: "AutistMask only supports Ethereum mainnet.",
             },
         };
     }
@@ -515,27 +499,6 @@ async function handleRpc(method, params, origin) {
     return { error: { message: "Unsupported method: " + method } };
 }
 
-// Broadcast chainChanged to all tabs when the network is switched.
-function broadcastChainChanged(chainId) {
-    tabsApi.query({}, (tabs) => {
-        for (const tab of tabs) {
-            tabsApi.sendMessage(
-                tab.id,
-                {
-                    type: "AUTISTMASK_EVENT",
-                    eventName: "chainChanged",
-                    data: chainId,
-                },
-                () => {
-                    if (runtime.lastError) {
-                        // expected for tabs without our content script
-                    }
-                },
-            );
-        }
-    });
-}
-
 // Broadcast accountsChanged to all tabs, respecting per-address permissions
 async function broadcastAccountsChanged() {
     // Clear non-remembered approvals on address switch

src/content/inpage.js

@@ -2,10 +2,7 @@
 // Creates window.ethereum (EIP-1193 provider) and announces via EIP-6963.
 
 (function () {
-    // Defaults to mainnet; updated dynamically via eth_chainId on init and
-    // chainChanged events from the extension.
-    let currentChainId = "0x1";
-    let currentNetworkVersion = "1";
+    const CHAIN_ID = "0x1"; // Ethereum mainnet
 
     const listeners = {};
     let nextId = 1;
@@ -31,12 +28,6 @@
         if (event.source !== window) return;
         if (event.data?.type !== "AUTISTMASK_EVENT") return;
         const { eventName, data } = event.data;
-        if (eventName === "chainChanged") {
-            currentChainId = data;
-            currentNetworkVersion = String(parseInt(data, 16));
-            provider.chainId = currentChainId;
-            provider.networkVersion = currentNetworkVersion;
-        }
         emit(eventName, data);
     });
 
@@ -66,8 +57,8 @@
     const provider = {
         isAutistMask: true,
         isMetaMask: true, // compatibility — many dApps check this
-        chainId: currentChainId,
-        networkVersion: currentNetworkVersion,
+        chainId: CHAIN_ID,
+        networkVersion: "1",
         selectedAddress: null,
 
         async request(args) {
@@ -84,12 +75,6 @@
                         ? result[0]
                         : null;
             }
-            if (args.method === "eth_chainId" && result) {
-                currentChainId = result;
-                currentNetworkVersion = String(parseInt(result, 16));
-                provider.chainId = currentChainId;
-                provider.networkVersion = currentNetworkVersion;
-            }
             return result;
         },
 
@@ -204,19 +189,4 @@
 
     window.addEventListener("eip6963:requestProvider", announceProvider);
     announceProvider();
-
-    // Fetch the current chain ID from the extension on load so the provider
-    // reflects the selected network immediately (covers Sepolia etc.).
-    sendRequest({ method: "eth_chainId", params: [] })
-        .then((chainId) => {
-            if (chainId) {
-                currentChainId = chainId;
-                currentNetworkVersion = String(parseInt(chainId, 16));
-                provider.chainId = currentChainId;
-                provider.networkVersion = currentNetworkVersion;
-            }
-        })
-        .catch(() => {
-            // Best-effort — keep defaults.
-        });
 })();

src/popup/index.html

@@ -882,24 +882,6 @@
                     </div>
                 </div>
 
-                <div class="bg-well p-3 mx-1 mb-3">
-                    <h3 class="font-bold mb-1">Network</h3>
-                    <p class="text-xs text-muted mb-1">
-                        Select the Ethereum network. Switching networks will
-                        update the RPC and Blockscout endpoints to their
-                        defaults.
-                    </p>
-                    <div class="text-xs flex items-center gap-1">
-                        <select
-                            id="settings-network"
-                            class="border border-border p-1 bg-bg text-fg text-xs cursor-pointer"
-                        >
-                            <option value="mainnet">Ethereum Mainnet</option>
-                            <option value="sepolia">Sepolia Testnet</option>
-                        </select>
-                    </div>
-                </div>
-
                 <div class="bg-well p-3 mx-1 mb-3">
                     <h3 class="font-bold mb-1">Ethereum RPC</h3>
                     <p class="text-xs text-muted mb-1">

src/popup/index.js

@@ -2,22 +2,10 @@
 // Loads state, initializes views, triggers first render.
 
 const { DEBUG } = require("../shared/constants");
-const {
-    state,
-    saveState,
-    loadState,
-    currentNetwork,
-} = require("../shared/state");
+const { state, saveState, loadState } = require("../shared/state");
 const { refreshPrices } = require("../shared/prices");
 const { refreshBalances } = require("../shared/balances");
-const {
-    $,
-    showView,
-    setRenderMain,
-    pushCurrentView,
-    goBack,
-    clearViewStack,
-} = require("./views/helpers");
+const { $, showView } = require("./views/helpers");
 const { applyTheme } = require("./theme");
 
 const home = require("./views/home");
@@ -65,42 +53,15 @@ async function doRefreshAndRender() {
 const ctx = {
     renderWalletList,
     doRefreshAndRender,
-    showAddWalletView: () => {
-        pushCurrentView();
-        addWallet.show();
-    },
-    showAddressDetail: () => {
-        pushCurrentView();
-        addressDetail.show();
-    },
-    showAddressToken: () => {
-        pushCurrentView();
-        addressToken.show();
-    },
-    showAddTokenView: () => {
-        pushCurrentView();
-        addToken.show();
-    },
-    showConfirmTx: (txInfo) => {
-        pushCurrentView();
-        confirmTx.show(txInfo);
-    },
-    showReceive: () => {
-        pushCurrentView();
-        receive.show();
-    },
-    showTransactionDetail: (tx) => {
-        pushCurrentView();
-        transactionDetail.show(tx);
-    },
-    showSettingsView: () => {
-        pushCurrentView();
-        settings.show();
-    },
-    showSettingsAddTokenView: () => {
-        pushCurrentView();
-        settingsAddToken.show();
-    },
+    showAddWalletView: () => addWallet.show(),
+    showAddressDetail: () => addressDetail.show(),
+    showAddressToken: () => addressToken.show(),
+    showAddTokenView: () => addToken.show(),
+    showConfirmTx: (txInfo) => confirmTx.show(txInfo),
+    showReceive: () => receive.show(),
+    showTransactionDetail: (tx) => transactionDetail.show(tx),
+    showSettingsView: () => settings.show(),
+    showSettingsAddTokenView: () => settingsAddToken.show(),
 };
 
 // Views that can be fully re-rendered from persisted state.
@@ -206,25 +167,18 @@ function fallbackView() {
 }
 
 async function init() {
-    await loadState();
-    applyTheme(state.theme);
-
-    const net = currentNetwork();
-    if (DEBUG || net.isTestnet) {
+    if (DEBUG) {
         const banner = document.createElement("div");
         banner.id = "debug-banner";
-        if (DEBUG && net.isTestnet) {
-            banner.textContent = "DEBUG / INSECURE [TESTNET]";
-        } else if (net.isTestnet) {
-            banner.textContent = "[TESTNET]";
-        } else {
         banner.textContent = "DEBUG / INSECURE";
-        }
         banner.style.cssText =
             "background:#c00;color:#fff;text-align:center;font-size:10px;padding:1px 0;font-family:monospace;position:sticky;top:0;z-index:9999;";
         document.body.prepend(banner);
     }
 
+    await loadState();
+    applyTheme(state.theme);
+
     // Auto-default active address
     if (
         state.activeAddress === null &&
@@ -254,15 +208,13 @@ async function init() {
                 .getElementById("view-settings")
                 .classList.contains("hidden")
         ) {
-            goBack();
+            renderWalletList();
+            showView("main");
             return;
         }
-        pushCurrentView();
         settings.show();
     });
 
-    setRenderMain(renderWalletList);
-
     welcome.init(ctx);
     addWallet.init(ctx);
     home.init(ctx);

src/popup/views/addToken.js

@@ -1,4 +1,4 @@
-const { $, showFlash, goBack } = require("./helpers");
+const { $, showView, showFlash } = require("./helpers");
 const { getTopTokens } = require("../../shared/tokenList");
 const { state, saveState } = require("../../shared/state");
 const { lookupTokenInfo } = require("../../shared/balances");
@@ -59,12 +59,7 @@ function init(ctx) {
             });
             await saveState();
             ctx.doRefreshAndRender();
-            // Pop the stack (back to address detail) and re-render it
-            // so the newly added token is visible immediately.
-            if (state.viewStack.length > 0) {
-                state.viewStack.pop();
-            }
-            require("./addressDetail").show();
+            ctx.showAddressDetail();
         } catch (e) {
             const detail = e.shortMessage || e.message || String(e);
             log.errorf("Token lookup failed for", contractAddr, detail);
@@ -74,9 +69,7 @@ function init(ctx) {
         }
     });
 
-    $("btn-add-token-back").addEventListener("click", () => {
-        goBack();
-    });
+    $("btn-add-token-back").addEventListener("click", ctx.showAddressDetail);
 }
 
 module.exports = { init, show };

src/popup/views/addWallet.js

@@ -1,4 +1,4 @@
-const { $, showView, showFlash, goBack, clearViewStack } = require("./helpers");
+const { $, showView, showFlash } = require("./helpers");
 const {
     generateMnemonic,
     hdWalletFromMnemonic,
@@ -143,7 +143,6 @@ async function importMnemonic(ctx) {
     state.wallets.push(wallet);
     state.hasWallet = true;
     await saveState();
-    clearViewStack();
     ctx.renderWalletList();
     showView("main");
 
@@ -199,7 +198,6 @@ async function importPrivateKey(ctx) {
     });
     state.hasWallet = true;
     await saveState();
-    clearViewStack();
     ctx.renderWalletList();
     showView("main");
 
@@ -251,7 +249,6 @@ async function importXprvKey(ctx) {
     state.wallets.push(wallet);
     state.hasWallet = true;
     await saveState();
-    clearViewStack();
     ctx.renderWalletList();
     showView("main");
 
@@ -300,7 +297,12 @@ function init(ctx) {
 
     // Back button
     $("btn-add-wallet-back").addEventListener("click", () => {
-        goBack();
+        if (!state.hasWallet) {
+            showView("welcome");
+        } else {
+            ctx.renderWalletList();
+            showView("main");
+        }
     });
 }
 

src/popup/views/addressDetail.js

@@ -10,8 +10,6 @@ const {
     truncateMiddle,
     renderAddressHtml,
     attachCopyHandlers,
-    goBack,
-    pushCurrentView,
 } = require("./helpers");
 const { state, currentAddress, saveState } = require("../../shared/state");
 const { formatUsd, getAddressValueUsd } = require("../../shared/prices");
@@ -249,7 +247,8 @@ function init(_ctx) {
     ctx = _ctx;
 
     $("btn-address-back").addEventListener("click", () => {
-        goBack();
+        ctx.renderWalletList();
+        showView("main");
     });
 
     $("btn-send").addEventListener("click", () => {
@@ -267,7 +266,6 @@ function init(_ctx) {
         $("send-token-static").classList.add("hidden");
         updateSendBalance();
         resetSendValidation();
-        pushCurrentView();
         showView("send");
     });
 
@@ -297,7 +295,6 @@ function init(_ctx) {
     $("btn-export-privkey").addEventListener("click", () => {
         moreDropdown.classList.add("hidden");
         moreBtn.classList.remove("bg-fg", "text-bg");
-        pushCurrentView();
         const wallet = state.wallets[state.selectedWallet];
         const addr = wallet.addresses[state.selectedAddress];
         const blockieEl = $("export-privkey-jazzicon");
@@ -370,7 +367,7 @@ function init(_ctx) {
     $("btn-export-privkey-back").addEventListener("click", () => {
         $("export-privkey-value").textContent = "";
         $("export-privkey-password").value = "";
-        goBack();
+        show();
     });
 }
 

src/popup/views/addressToken.js

@@ -13,8 +13,6 @@ const {
     balanceLine,
     renderAddressHtml,
     attachCopyHandlers,
-    goBack,
-    pushCurrentView,
 } = require("./helpers");
 const { state, currentAddress, saveState } = require("../../shared/state");
 const { TOKEN_BY_ADDRESS, resolveSymbol } = require("../../shared/tokenList");
@@ -150,7 +148,7 @@ function show() {
     attachCopyHandlers($("address-token-line"));
 
     // USD total for this token only
-    const usdVal = price ? amount * price : null;
+    const usdVal = price ? amount * price : 0;
     const usdStr = formatUsd(usdVal);
     $("address-token-usd-total").innerHTML = usdStr || " ";
 
@@ -333,7 +331,7 @@ function init(_ctx) {
     });
 
     $("btn-address-token-back").addEventListener("click", () => {
-        goBack();
+        ctx.showAddressDetail();
     });
 
     $("btn-address-token-send").addEventListener("click", () => {
@@ -367,7 +365,6 @@ function init(_ctx) {
         attachCopyHandlers($("send-token-static"));
         updateSendBalance();
         resetSendValidation();
-        pushCurrentView();
         showView("send");
     });
 

src/popup/views/approval.js

@@ -8,9 +8,8 @@ const {
     renderAddressHtml,
     attachCopyHandlers,
 } = require("./helpers");
-const { state, saveState, currentNetwork } = require("../../shared/state");
+const { state, saveState } = require("../../shared/state");
 const { formatEther, formatUnits, Interface, toUtf8String } = require("ethers");
-const { getPrice, formatUsd } = require("../../shared/prices");
 const { ERC20_ABI } = require("../../shared/constants");
 const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
 const txStatus = require("./txStatus");
@@ -220,14 +219,8 @@ function showTxApproval(details) {
         $("approve-tx-to").innerHTML = escapeHtml("(contract creation)");
     }
 
-    const ethValueFormatted = formatTxValue(
-        formatEther(details.txParams.value || "0"),
-    );
-    const ethPrice = getPrice("ETH");
-    const ethUsd = ethPrice ? parseFloat(ethValueFormatted) * ethPrice : null;
-    const usdStr = formatUsd(ethUsd);
     $("approve-tx-value").textContent =
-        ethValueFormatted + " ETH" + (usdStr ? " (" + usdStr + ")" : "");
+        formatTxValue(formatEther(details.txParams.value || "0")) + " ETH";
 
     // Decode calldata (reuse decoded from above)
     const decodedEl = $("approve-tx-decoded");

src/popup/views/confirmTx.js

@@ -20,9 +20,8 @@ const {
     escapeHtml,
     renderAddressHtml,
     attachCopyHandlers,
-    goBack,
 } = require("./helpers");
-const { state, currentNetwork } = require("../../shared/state");
+const { state } = require("../../shared/state");
 const { getSignerForAddress } = require("../../shared/wallet");
 const { decryptWithPassword } = require("../../shared/vault");
 const { formatUsd, getPrice } = require("../../shared/prices");
@@ -356,7 +355,7 @@ function init(ctx) {
     });
 
     $("btn-confirm-back").addEventListener("click", () => {
-        goBack();
+        showView("send");
     });
 }
 

src/popup/views/deleteWallet.js

@@ -1,4 +1,4 @@
-const { $, showView, showFlash, goBack, clearViewStack } = require("./helpers");
+const { $, showView, showFlash } = require("./helpers");
 const { state, saveState } = require("../../shared/state");
 const { decryptWithPassword } = require("../../shared/vault");
 
@@ -21,7 +21,7 @@ function init(_ctx) {
 
     $("btn-delete-wallet-back").addEventListener("click", () => {
         deleteWalletIndex = null;
-        goBack();
+        ctx.showSettingsView();
     });
 
     $("btn-delete-wallet-confirm").addEventListener("click", async () => {
@@ -77,7 +77,6 @@ function init(_ctx) {
             state.selectedWallet = null;
             state.selectedAddress = null;
             state.activeAddress = null;
-            clearViewStack();
             await saveState();
             showView("welcome");
         } else {
@@ -87,14 +86,8 @@ function init(_ctx) {
             state.activeAddress =
                 state.wallets[0].addresses[0]?.address || null;
             await saveState();
-            // Reset stack to [main] so Settings back goes home.
-            // Use require() lazily to avoid circular dependency
-            // (settings.js requires deleteWallet.js).
-            clearViewStack();
-            state.viewStack.push("main");
             ctx.renderWalletList();
-            const settings = require("./settings");
-            settings.show();
+            ctx.showSettingsView();
             showFlash("Wallet deleted.");
         }
     });

src/popup/views/helpers.js

@@ -6,7 +6,7 @@ const {
     getPrice,
     getAddressValueUsd,
 } = require("../../shared/prices");
-const { state, saveState, currentNetwork } = require("../../shared/state");
+const { state, saveState } = require("../../shared/state");
 
 // When views are added, removed, or transitions between them change,
 // update the view-navigation documentation in README.md to match.
@@ -59,57 +59,12 @@ function showView(name) {
     clearFlash();
     state.currentView = name;
     saveState();
-    const net = currentNetwork();
-    if (DEBUG || net.isTestnet) {
+    if (DEBUG) {
         const banner = document.getElementById("debug-banner");
         if (banner) {
-            if (DEBUG && net.isTestnet) {
-                banner.textContent =
-                    "DEBUG / INSECURE [TESTNET] (" + name + ")";
-            } else if (net.isTestnet) {
-                banner.textContent = "[TESTNET]";
-            } else {
             banner.textContent = "DEBUG / INSECURE (" + name + ")";
         }
     }
-    }
-}
-
-// Callback to re-render the main/home view when navigating back to it.
-// Set once by index.js via setRenderMain().
-let _renderMain = null;
-
-function setRenderMain(fn) {
-    _renderMain = fn;
-}
-
-// Push the current view onto the navigation stack so goBack() can
-// return to it.  Call this before any forward navigation.
-function pushCurrentView() {
-    if (state.currentView) {
-        state.viewStack.push(state.currentView);
-    }
-}
-
-// Pop the navigation stack and show the previous view.  If the stack
-// is empty, fall back to the main (home) view.
-function goBack() {
-    let target;
-    if (state.viewStack.length > 0) {
-        target = state.viewStack.pop();
-    } else {
-        target = "main";
-    }
-    if (target === "main" && _renderMain) {
-        _renderMain();
-    }
-    showView(target);
-}
-
-// Clear the entire navigation stack (used when resetting to root,
-// e.g. after adding or deleting a wallet).
-function clearViewStack() {
-    state.viewStack = [];
 }
 
 let flashTimer = null;
@@ -323,7 +278,7 @@ const EXT_ICON =
     `</svg></span>`;
 
 function etherscanAddressUrl(address) {
-    return `${currentNetwork().explorerUrl}/address/${address}`;
+    return `https://etherscan.io/address/${address}`;
 }
 
 function etherscanLinkHtml(url) {
@@ -417,10 +372,6 @@ module.exports = {
     showError,
     hideError,
     showView,
-    setRenderMain,
-    pushCurrentView,
-    goBack,
-    clearViewStack,
     showFlash,
     flashCopyFeedback,
     balanceLine,

src/popup/views/home.js

@@ -12,7 +12,6 @@ const {
     truncateMiddle,
     renderAddressHtml,
     attachCopyHandlers,
-    pushCurrentView,
 } = require("./helpers");
 const { state, saveState, currentAddress } = require("../../shared/state");
 const {
@@ -382,7 +381,6 @@ function init(ctx) {
         renderSendTokenSelect(addr);
         updateSendBalance();
         resetSendValidation();
-        pushCurrentView();
         showView("send");
     });
 

src/popup/views/receive.js

@@ -6,9 +6,8 @@ const {
     formatAddressHtml,
     addressTitle,
     attachCopyHandlers,
-    goBack,
 } = require("./helpers");
-const { state, currentAddress, currentNetwork } = require("../../shared/state");
+const { state, currentAddress } = require("../../shared/state");
 const QRCode = require("qrcode");
 
 function show() {
@@ -45,9 +44,7 @@ function show() {
         warningEl.textContent =
             "This is an ERC-20 token. Only send " +
             symbol +
-            " on " +
-            currentNetwork().name +
-            " to this address. Sending tokens on other networks will result in permanent loss.";
+            " on the Ethereum network to this address. Sending tokens on other networks will result in permanent loss.";
         warningEl.style.visibility = "visible";
     } else {
         warningEl.textContent = "";
@@ -68,7 +65,11 @@ function init(ctx) {
     });
 
     $("btn-receive-back").addEventListener("click", () => {
-        goBack();
+        if (state.selectedToken) {
+            ctx.showAddressToken();
+        } else {
+            ctx.showAddressDetail();
+        }
     });
 }
 

src/popup/views/send.js

@@ -7,7 +7,6 @@ const {
     escapeHtml,
     renderAddressHtml,
     attachCopyHandlers,
-    goBack,
 } = require("./helpers");
 const { state, currentAddress } = require("../../shared/state");
 let ctx;
@@ -251,7 +250,11 @@ function init(_ctx) {
     $("btn-send-back").addEventListener("click", () => {
         $("send-token").classList.remove("hidden");
         $("send-token-static").classList.add("hidden");
-        goBack();
+        if (state.selectedToken) {
+            ctx.showAddressToken();
+        } else {
+            ctx.showAddressDetail();
+        }
     });
 }
 

src/popup/views/settings.js

@@ -1,15 +1,7 @@
-const {
-    $,
-    showView,
-    showFlash,
-    escapeHtml,
-    goBack,
-    pushCurrentView,
-} = require("./helpers");
+const { $, showView, showFlash, escapeHtml } = require("./helpers");
 const { applyTheme } = require("../theme");
-const { state, saveState, currentNetwork } = require("../../shared/state");
-const { NETWORKS, SUPPORTED_CHAIN_IDS } = require("../../shared/networks");
-const { onChainSwitch } = require("../../shared/chainSwitch");
+const { state, saveState } = require("../../shared/state");
+const { ETHEREUM_MAINNET_CHAIN_ID } = require("../../shared/constants");
 const { log, debugFetch } = require("../../shared/log");
 const deleteWallet = require("./deleteWallet");
 
@@ -93,7 +85,6 @@ function renderWalletListSettings() {
     container.querySelectorAll(".btn-delete-wallet").forEach((btn) => {
         btn.addEventListener("click", () => {
             const idx = parseInt(btn.dataset.idx, 10);
-            pushCurrentView();
             deleteWallet.show(idx);
         });
     });
@@ -134,10 +125,6 @@ function renderWalletListSettings() {
 function show() {
     $("settings-rpc").value = state.rpcUrl;
     $("settings-blockscout").value = state.blockscoutUrl;
-    const networkSelect = $("settings-network");
-    if (networkSelect) {
-        networkSelect.value = state.networkId;
-    }
     renderTrackedTokens();
     renderSiteLists();
     renderWalletListSettings();
@@ -181,12 +168,9 @@ function init(ctx) {
                 showFlash("Endpoint returned error: " + json.error.message);
                 return;
             }
-            const net = currentNetwork();
-            if (json.result !== net.chainId) {
+            if (json.result !== ETHEREUM_MAINNET_CHAIN_ID) {
                 showFlash(
-                    "Wrong network (expected " +
-                        net.name +
-                        ", got chain " +
+                    "Wrong network (expected mainnet, got chain " +
                         json.result +
                         ").",
                 );
@@ -225,17 +209,6 @@ function init(ctx) {
         showFlash("Saved.");
     });
 
-    const networkSelect = $("settings-network");
-    if (networkSelect) {
-        networkSelect.addEventListener("change", async () => {
-            const newId = networkSelect.value;
-            const net = await onChainSwitch(newId);
-            $("settings-rpc").value = state.rpcUrl;
-            $("settings-blockscout").value = state.blockscoutUrl;
-            showFlash("Switched to " + net.name + ".");
-        });
-    }
-
     $("settings-show-zero-balances").checked = state.showZeroBalanceTokens;
     $("settings-show-zero-balances").addEventListener("change", async () => {
         state.showZeroBalanceTokens = $("settings-show-zero-balances").checked;
@@ -290,7 +263,8 @@ function init(ctx) {
     );
 
     $("btn-settings-back").addEventListener("click", () => {
-        goBack();
+        ctx.renderWalletList();
+        showView("main");
     });
 }
 

src/popup/views/settingsAddToken.js

@@ -1,4 +1,4 @@
-const { $, showView, showFlash, goBack } = require("./helpers");
+const { $, showView, showFlash } = require("./helpers");
 const { getTopTokens } = require("../../shared/tokenList");
 const { state, saveState } = require("../../shared/state");
 const { lookupTokenInfo } = require("../../shared/balances");
@@ -84,7 +84,7 @@ function init(_ctx) {
     ctx = _ctx;
 
     $("btn-settings-addtoken-back").addEventListener("click", () => {
-        goBack();
+        ctx.showSettingsView();
     });
 
     $("btn-settings-addtoken-select").addEventListener("click", async () => {

src/popup/views/transactionDetail.js

@@ -14,9 +14,8 @@ const {
     attachCopyHandlers,
     copyableHtml,
     etherscanLinkHtml,
-    goBack,
 } = require("./helpers");
-const { state, currentNetwork } = require("../../shared/state");
+const { state } = require("../../shared/state");
 const { formatEther, formatUnits } = require("ethers");
 const makeBlockie = require("ethereum-blockies-base64");
 const { log, debugFetch } = require("../../shared/log");
@@ -57,7 +56,7 @@ function txAddressHtml(address, ensName, title) {
 }
 
 function txHashHtml(hash) {
-    const link = `${currentNetwork().explorerUrl}/tx/${hash}`;
+    const link = `https://etherscan.io/tx/${hash}`;
     const extLink = etherscanLinkHtml(link);
     return copyableHtml(hash, "break-all") + extLink;
 }
@@ -134,7 +133,7 @@ function render() {
     if (tokenContractSection && tokenContractEl) {
         if (tx.contractAddress) {
             const dot = addressDotHtml(tx.contractAddress);
-            const link = `${currentNetwork().explorerUrl}/token/${tx.contractAddress}`;
+            const link = `https://etherscan.io/token/${tx.contractAddress}`;
             tokenContractEl.innerHTML =
                 `<div class="flex items-center">${dot}` +
                 copyableHtml(tx.contractAddress, "break-all") +
@@ -186,7 +185,7 @@ function showDetailField(sectionId, contentId, value) {
 function populateOnChainDetails(txData) {
     // Block number
     if (txData.block_number != null) {
-        const blockLink = `${currentNetwork().explorerUrl}/block/${txData.block_number}`;
+        const blockLink = `https://etherscan.io/block/${txData.block_number}`;
         const blockSection = $("tx-detail-block-section");
         const blockEl = $("tx-detail-block");
         if (blockSection && blockEl) {
@@ -351,7 +350,11 @@ async function loadFullTxDetails(txHash, toAddress, isContractCall) {
 function init(_ctx) {
     ctx = _ctx;
     $("btn-tx-back").addEventListener("click", () => {
-        goBack();
+        if (state.selectedToken) {
+            ctx.showAddressToken();
+        } else {
+            ctx.showAddressDetail();
+        }
     });
 }
 

src/popup/views/txStatus.js

@@ -9,10 +9,9 @@ const {
     attachCopyHandlers,
     copyableHtml,
     etherscanLinkHtml,
-    clearViewStack,
 } = require("./helpers");
 const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
-const { state, saveState, currentNetwork } = require("../../shared/state");
+const { state, saveState } = require("../../shared/state");
 const { getProvider } = require("../../shared/balances");
 const { log } = require("../../shared/log");
 
@@ -37,13 +36,13 @@ function toAddressHtml(address) {
 }
 
 function txHashHtml(hash) {
-    const link = `${currentNetwork().explorerUrl}/tx/${hash}`;
+    const link = `https://etherscan.io/tx/${hash}`;
     return copyableHtml(hash, "break-all") + etherscanLinkHtml(link);
 }
 
 function blockNumberHtml(blockNumber) {
     const num = String(blockNumber);
-    const link = `${currentNetwork().explorerUrl}/block/${num}`;
+    const link = `https://etherscan.io/block/${num}`;
     return copyableHtml(num) + etherscanLinkHtml(link);
 }
 
@@ -111,7 +110,7 @@ function tokenLabel(address) {
 }
 
 function etherscanTokenLink(address) {
-    return `${currentNetwork().explorerUrl}/token/${address}`;
+    return `https://etherscan.io/token/${address}`;
 }
 
 function decodedDetailsHtml(decoded) {
@@ -222,16 +221,10 @@ function navigateBack() {
         window.close();
         return;
     }
-    // After a completed transaction, reset the navigation stack
-    // and go directly to the address view (token or detail).
-    // Use require() lazily to call show() without the ctx push wrapper.
-    clearViewStack();
-    state.viewStack.push("main");
     if (state.selectedToken) {
-        state.viewStack.push("address");
-        require("./addressToken").show();
+        ctx.showAddressToken();
     } else {
-        require("./addressDetail").show();
+        ctx.showAddressDetail();
     }
 }
 

src/shared/balances.js

@@ -15,15 +15,10 @@ const { KNOWN_SYMBOLS, TOKEN_BY_ADDRESS } = require("./tokenList");
 
 // Use a static network to skip auto-detection (which can fail and cause
 // "could not coalesce error" on some RPC endpoints like Cloudflare).
-// Accepts an optional networkName ("mainnet" or "sepolia") for the static
-// network hint so ethers picks the right chain parameters.  When omitted,
-// reads the currently selected network from extension state.
-function getProvider(rpcUrl, networkName) {
-    // Lazy require to avoid circular dependency issues at module scope.
-    const { currentNetwork } = require("./state");
-    const name = networkName || currentNetwork().id;
-    const net = Network.from(name);
-    return new JsonRpcProvider(rpcUrl, net, { staticNetwork: net });
+const mainnet = Network.from("mainnet");
+
+function getProvider(rpcUrl) {
+    return new JsonRpcProvider(rpcUrl, mainnet, { staticNetwork: mainnet });
 }
 
 function formatBalance(wei) {

src/shared/chainSwitch.js

@@ -1,57 +0,0 @@
-// Consolidated chain-switch handler.
-//
-// Every state change required when the active network changes is
-// performed here so that callers (settings UI, background
-// wallet_switchEthereumChain, future chain additions) all go
-// through a single code path.
-//
-// Adding a new chain (e.g. ETC) requires only a new entry in
-// networks.js — no per-caller wiring is needed.
-
-const { networkById } = require("./networks");
-const { clearPrices } = require("./prices");
-
-// Switch the active chain and reset all chain-specific cached state.
-// Returns the network configuration object for the new chain.
-async function onChainSwitch(newNetworkId) {
-    const { state, saveState } = require("./state");
-
-    const net = networkById(newNetworkId);
-
-    // --- core identity ---
-    state.networkId = net.id;
-    state.rpcUrl = net.defaultRpcUrl;
-    state.blockscoutUrl = net.defaultBlockscoutUrl;
-
-    // --- price cache ---
-    // Prices are chain-specific (testnet tokens are worthless,
-    // ETC has different pricing, etc.).
-    clearPrices();
-
-    // --- balance / refresh state ---
-    // Reset last-refresh timestamp so the next polling cycle
-    // triggers an immediate balance refresh on the new chain.
-    state.lastBalanceRefresh = 0;
-
-    // Clear per-address balances and token balances so stale data
-    // from the previous chain is never displayed while the first
-    // refresh on the new chain is in flight.
-    for (const wallet of state.wallets) {
-        for (const addr of wallet.addresses) {
-            addr.balance = "0";
-            addr.tokenBalances = [];
-        }
-    }
-
-    // --- chain-specific caches ---
-    // Token holder counts and fraud contract lists are
-    // chain-specific and must not carry over.
-    state.tokenHolderCache = {};
-    state.fraudContracts = [];
-
-    await saveState();
-
-    return net;
-}
-
-module.exports = { onChainSwitch };

src/shared/constants.js

@@ -3,7 +3,6 @@ const DEBUG_MNEMONIC =
     "cube evolve unfold result inch risk jealous skill hotel bulb night wreck";
 
 const ETHEREUM_MAINNET_CHAIN_ID = "0x1";
-const ETHEREUM_SEPOLIA_CHAIN_ID = "0xaa36a7";
 
 const DEFAULT_RPC_URL = "https://ethereum-rpc.publicnode.com";
 
@@ -38,7 +37,6 @@ module.exports = {
     DEBUG,
     DEBUG_MNEMONIC,
     ETHEREUM_MAINNET_CHAIN_ID,
-    ETHEREUM_SEPOLIA_CHAIN_ID,
     DEFAULT_RPC_URL,
     DEFAULT_BLOCKSCOUT_URL,
     BIP44_ETH_PATH,

src/shared/etherscanLabels.js

@@ -2,6 +2,8 @@
 // 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];
@@ -72,19 +74,12 @@ function parseEtherscanPage(html) {
  * Returns a warning object if the address is flagged, or null.
  * Network failures return null silently (best-effort check).
  *
- * Uses the current network's explorer URL so the lookup works on both
- * mainnet (etherscan.io) and Sepolia (sepolia.etherscan.io).
- *
  * @param {string} address - Ethereum address to check.
  * @returns {Promise<{type: string, message: string, severity: string}|null>}
  */
 async function checkEtherscanLabel(address) {
     try {
-        // Lazy require to avoid pulling in chrome.storage at module scope
-        // (which breaks unit tests that only exercise parseEtherscanPage).
-        const { currentNetwork } = require("./state");
-        const etherscanBase = currentNetwork().explorerUrl + "/address/";
-        const resp = await fetch(etherscanBase + address, {
+        const resp = await fetch(ETHERSCAN_BASE + address, {
             headers: { Accept: "text/html" },
         });
         if (!resp.ok) return null;

src/shared/networks.js

@@ -1,57 +0,0 @@
-// Network definitions for supported Ethereum networks.
-// Each network specifies its chain ID, default RPC and Blockscout endpoints,
-// and the block explorer base URL used for address/tx/token/block links.
-
-const NETWORKS = {
-    mainnet: {
-        id: "mainnet",
-        name: "Ethereum Mainnet",
-        chainId: "0x1",
-        networkVersion: "1",
-        nativeCurrency: "ETH",
-        defaultRpcUrl: "https://ethereum-rpc.publicnode.com",
-        defaultBlockscoutUrl: "https://eth.blockscout.com/api/v2",
-        explorerUrl: "https://etherscan.io",
-        isTestnet: false,
-    },
-    sepolia: {
-        id: "sepolia",
-        name: "Sepolia Testnet",
-        chainId: "0xaa36a7",
-        networkVersion: "11155111",
-        nativeCurrency: "SepoliaETH",
-        defaultRpcUrl: "https://ethereum-sepolia-rpc.publicnode.com",
-        defaultBlockscoutUrl: "https://eth-sepolia.blockscout.com/api/v2",
-        explorerUrl: "https://sepolia.etherscan.io",
-        isTestnet: true,
-    },
-};
-
-const SUPPORTED_CHAIN_IDS = new Set(
-    Object.values(NETWORKS).map((n) => n.chainId),
-);
-
-function networkById(id) {
-    return NETWORKS[id] || NETWORKS.mainnet;
-}
-
-function networkByChainId(chainId) {
-    for (const net of Object.values(NETWORKS)) {
-        if (net.chainId === chainId) return net;
-    }
-    return null;
-}
-
-// Build a block explorer link for the given path type and value.
-// type: "address" | "tx" | "token" | "block"
-function explorerLink(network, type, value) {
-    return `${network.explorerUrl}/${type}/${value}`;
-}
-
-module.exports = {
-    NETWORKS,
-    SUPPORTED_CHAIN_IDS,
-    networkById,
-    networkByChainId,
-    explorerLink,
-};

src/shared/prices.js

@@ -8,13 +8,6 @@ const prices = {};
 let lastFetchedAt = 0;
 
 async function refreshPrices() {
-    // Testnet tokens have no real market value — skip price fetching
-    // and clear any stale mainnet prices so the UI shows no USD values.
-    const { currentNetwork } = require("./state");
-    if (currentNetwork().isTestnet) {
-        clearPrices();
-        return;
-    }
     const now = Date.now();
     if (now - lastFetchedAt < PRICE_CACHE_TTL) return;
     try {
@@ -26,19 +19,7 @@ async function refreshPrices() {
     }
 }
 
-// Clear all cached prices and reset the fetch timestamp so the
-// next refreshPrices() call will fetch fresh data.
-function clearPrices() {
-    for (const key of Object.keys(prices)) {
-        delete prices[key];
-    }
-    lastFetchedAt = 0;
-}
-
-// Return the USD price for a symbol, or null on testnet / unknown.
 function getPrice(symbol) {
-    const { currentNetwork } = require("./state");
-    if (currentNetwork().isTestnet) return null;
     return prices[symbol] || null;
 }
 
@@ -56,8 +37,6 @@ function formatUsd(amount) {
 }
 
 function getAddressValueUsd(addr) {
-    const { currentNetwork } = require("./state");
-    if (currentNetwork().isTestnet) return null;
     if (!prices.ETH) return null;
     let total = 0;
     const ethBal = parseFloat(addr.balance || "0");
@@ -72,8 +51,6 @@ function getAddressValueUsd(addr) {
 }
 
 function getWalletValueUsd(wallet) {
-    const { currentNetwork } = require("./state");
-    if (currentNetwork().isTestnet) return null;
     if (!prices.ETH) return null;
     let total = 0;
     for (const addr of wallet.addresses) {
@@ -83,8 +60,6 @@ function getWalletValueUsd(wallet) {
 }
 
 function getTotalValueUsd(wallets) {
-    const { currentNetwork } = require("./state");
-    if (currentNetwork().isTestnet) return null;
     if (!prices.ETH) return null;
     let total = 0;
     for (const wallet of wallets) {
@@ -96,7 +71,6 @@ function getTotalValueUsd(wallets) {
 module.exports = {
     prices,
     refreshPrices,
-    clearPrices,
     getPrice,
     formatUsd,
     getAddressValueUsd,

src/shared/state.js

@@ -1,7 +1,6 @@
 // State management and extension storage persistence.
 
 const { DEFAULT_RPC_URL, DEFAULT_BLOCKSCOUT_URL } = require("./constants");
-const { networkById } = require("./networks");
 
 const storageApi =
     typeof browser !== "undefined"
@@ -12,7 +11,6 @@ const DEFAULT_STATE = {
     hasWallet: false,
     wallets: [],
     trackedTokens: [],
-    networkId: "mainnet",
     rpcUrl: DEFAULT_RPC_URL,
     blockscoutUrl: DEFAULT_BLOCKSCOUT_URL,
     lastBalanceRefresh: 0,
@@ -38,20 +36,13 @@ const state = {
     selectedAddress: null,
     selectedToken: null,
     viewData: {},
-    viewStack: [],
 };
 
-// Return the network configuration for the currently selected network.
-function currentNetwork() {
-    return networkById(state.networkId);
-}
-
 async function saveState() {
     const persisted = {
         hasWallet: state.hasWallet,
         wallets: state.wallets,
         trackedTokens: state.trackedTokens,
-        networkId: state.networkId,
         rpcUrl: state.rpcUrl,
         blockscoutUrl: state.blockscoutUrl,
         lastBalanceRefresh: state.lastBalanceRefresh,
@@ -73,7 +64,6 @@ async function saveState() {
         selectedAddress: state.selectedAddress,
         selectedToken: state.selectedToken,
         viewData: state.viewData,
-        viewStack: state.viewStack,
     };
     await storageApi.set({ autistmask: persisted });
 }
@@ -85,7 +75,6 @@ async function loadState() {
         state.hasWallet = saved.hasWallet;
         state.wallets = saved.wallets || [];
         state.trackedTokens = saved.trackedTokens || [];
-        state.networkId = saved.networkId || DEFAULT_STATE.networkId;
         state.rpcUrl = saved.rpcUrl || DEFAULT_STATE.rpcUrl;
         state.blockscoutUrl =
             saved.blockscoutUrl || DEFAULT_STATE.blockscoutUrl;
@@ -135,7 +124,6 @@ async function loadState() {
             saved.selectedAddress !== undefined ? saved.selectedAddress : null;
         state.selectedToken = saved.selectedToken || null;
         state.viewData = saved.viewData || {};
-        state.viewStack = Array.isArray(saved.viewStack) ? saved.viewStack : [];
     }
 }
 
@@ -146,10 +134,4 @@ function currentAddress() {
     return state.wallets[state.selectedWallet].addresses[state.selectedAddress];
 }
 
-module.exports = {
-    state,
-    saveState,
-    loadState,
-    currentAddress,
-    currentNetwork,
-};
+module.exports = { state, saveState, loadState, currentAddress };