diff --git a/background.js b/background.js
new file mode 100644
index 0000000..de48edb
--- /dev/null
+++ b/background.js
@@ -0,0 +1,105 @@
+/* global chrome, browser */
+const API = typeof chrome !== "undefined" ? chrome : browser;
+
+function canonicalizeAliExpress(urlString) {
+  const url = new URL(urlString);
+  const path = url.pathname;
+  const canonicalHost = "www.aliexpress.com";
+  let productId = null;
+  const itemMatch = path.match(/\/(item|i)\/(\d+)\.html/i);
+  if (itemMatch) productId = itemMatch[2];
+  if (!productId) {
+    const xObjectId = url.searchParams.get("x_object_id") || url.searchParams.get("item_id");
+    if (xObjectId && /^\d+$/.test(xObjectId)) productId = xObjectId;
+  }
+  if (productId) return `https://${canonicalHost}/item/${productId}.html`;
+  return `https://${canonicalHost}${path}`;
+}
+
+function canonicalizeAlibaba(urlString) {
+  const url = new URL(urlString);
+  return `${url.origin}${url.pathname}`;
+}
+
+function canonicalize(urlString) {
+  const url = new URL(urlString);
+  const hostname = url.hostname.toLowerCase();
+  if (hostname.includes("aliexpress.")) return { vendor: "AliExpress", url: canonicalizeAliExpress(urlString) };
+  if (hostname.includes("alibaba.")) return { vendor: "Alibaba", url: canonicalizeAlibaba(urlString) };
+  return { vendor: "Unknown", url: `${url.origin}${url.pathname}` };
+}
+
+async function shortenWithIsGd(longUrl) {
+  const endpoint = `https://is.gd/create.php?format=simple&url=${encodeURIComponent(longUrl)}`;
+  const res = await fetch(endpoint, { method: "GET" });
+  const text = await res.text();
+  if (!res.ok) throw new Error(text || `Shorten failed (${res.status})`);
+  if (!/^https?:\/\//i.test(text)) throw new Error(text || "Shorten failed");
+  return text.trim();
+}
+
+function createMenus() {
+  try { API.contextMenus.removeAll(() => {}); } catch (e) {}
+  API.contextMenus.create({
+    id: "ali-clean",
+    title: "Copy clean Ali link",
+    contexts: ["page", "selection", "link"],
+    documentUrlPatterns: [
+      "*://*.aliexpress.*/*",
+      "*://*.alibaba.*/*"
+    ]
+  });
+  API.contextMenus.create({
+    id: "ali-shorten",
+    title: "Copy short Ali link",
+    contexts: ["page", "selection", "link"],
+    documentUrlPatterns: [
+      "*://*.aliexpress.*/*",
+      "*://*.alibaba.*/*"
+    ]
+  });
+}
+
+async function getRelevantUrl(info, tab) {
+  if (info.linkUrl) return info.linkUrl;
+  return tab && tab.url ? tab.url : null;
+}
+
+async function copyTextToClipboard(tabId, text) {
+  // Using scripting to execute in page context for broad compatibility
+  const code = `navigator.clipboard.writeText(${JSON.stringify(text)}).then(() => true).catch(() => false);`;
+  try {
+    const results = await API.scripting.executeScript({
+      target: { tabId },
+      func: (t) => navigator.clipboard.writeText(t).then(() => true).catch(() => false),
+      args: [text]
+    });
+    const ok = results && results[0] && results[0].result;
+    return !!ok;
+  } catch (e) {
+    return false;
+  }
+}
+
+API.runtime.onInstalled && API.runtime.onInstalled.addListener(() => {
+  createMenus();
+});
+
+API.contextMenus.onClicked.addListener(async (info, tab) => {
+  if (!tab || !tab.id) return;
+  const rawUrl = await getRelevantUrl(info, tab);
+  if (!rawUrl) return;
+  const { url } = canonicalize(rawUrl);
+  if (info.menuItemId === "ali-clean") {
+    await copyTextToClipboard(tab.id, url);
+  } else if (info.menuItemId === "ali-shorten") {
+    try {
+      const shortUrl = await shortenWithIsGd(url);
+      await copyTextToClipboard(tab.id, shortUrl);
+    } catch (e) {
+      await copyTextToClipboard(tab.id, url);
+    }
+  }
+});
+
+
diff --git a/build.sh b/build.sh
index b22cc5a..cb672f1 100644
--- a/build.sh
+++ b/build.sh
@@ -19,7 +19,7 @@ cleanup() {
 trap cleanup EXIT
 
 # Common files
-for f in manifest.json popup.html popup.js; do
+for f in manifest.json popup.html popup.js background.js; do
   cp "$ROOT_DIR/$f" "$WORK_CHROME/"
   cp "$ROOT_DIR/$f" "$WORK_FIREFOX/"
 done
diff --git a/dist/ali-sharelink-chrome.zip b/dist/ali-sharelink-chrome.zip
index 07c1803..c5255cd 100644
Binary files a/dist/ali-sharelink-chrome.zip and b/dist/ali-sharelink-chrome.zip differ
diff --git a/dist/ali-sharelink-firefox.zip b/dist/ali-sharelink-firefox.zip
index 07c1803..c5255cd 100644
Binary files a/dist/ali-sharelink-firefox.zip and b/dist/ali-sharelink-firefox.zip differ
diff --git a/manifest.json b/manifest.json
index 488c0ed..b2b248b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -3,6 +3,9 @@
   "name": "Ali Sharelink",
   "version": "0.1.0",
   "description": "Get a clean, canonical share link for AliExpress/Alibaba products, with optional shortlink.",
+  "background": {
+    "service_worker": "background.js"
+  },
   "action": {
     "default_title": "Ali Sharelink",
     "default_popup": "popup.html"
@@ -10,7 +13,9 @@
   "permissions": [
     "activeTab",
     "tabs",
-    "clipboardWrite"
+    "clipboardWrite",
+    "contextMenus",
+    "scripting"
   ],
   "host_permissions": [
     "https://is.gd/*"