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Chromium (Manifest v3)/background.js

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+chrome.action.onClicked.addListener(function (tab) {
+  const input = tab.url;
+  const formattedInput = doubleEncodeURL(input);
+  const link = formattedInput ? `https://www.virustotal.com/gui/search/${formattedInput}` : null;
+
+  if (link) {
+    openInNewTab(link);
+  }
+});
+
+const openInNewTab = (url) => {
+  chrome.tabs.create({ url: url });
+};
+
+const doubleEncodeURL = (input) => {
+  try {
+    const url = new URL(input);
+    return encodeURIComponent(encodeURIComponent(url.href));
+  } catch (error) {
+    return null;
+  }
+};

Chromium (Manifest v3)/manifest.json

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+{
+  "manifest_version": 3,
+  "name": "VirusTotal Website Security Check",
+  "version": "1.0",
+  "description": "Automatically opens a VirusTotal website scan page on the URL you are visiting right now, in just a click of a button.",
+  "permissions": ["activeTab"],
+  "background": {
+    "service_worker": "background.js"
+  },
+  "action": {
+    "default_icon": {
+      "16": "favicon-16x16.png",
+      "32": "favicon-32x32.png",
+      "192": "android-chrome-192x192.png"
+    }
+  }
+}

Firefox (Manifest v2)/background.js

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+chrome.browserAction.onClicked.addListener(function (tab) {
+  const input = tab.url;
+  const formattedInput = doubleEncodeURL(input);
+  const link = formattedInput ? `https://www.virustotal.com/gui/search/${formattedInput}` : null;
+
+  if (link) {
+    openInNewTab(link);
+  }
+});
+
+const openInNewTab = (url) => {
+  chrome.tabs.create({ url: url });
+};
+
+const doubleEncodeURL = (input) => {
+  try {
+    const url = new URL(input);
+    return encodeURIComponent(encodeURIComponent(url.href));
+  } catch (error) {
+    return null;
+  }
+};

Firefox (Manifest v2)/manifest.json

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+{
+  "manifest_version": 2,
+  "name": "VirusTotal Website Security Check",
+  "version": "1.0",
+  "description": "Automatically opens a VirusTotal website scan page on the URL you are visiting right now, in just a click of a button.",
+  "icons": {
+      "16": "favicon-16x16.png",
+      "32": "favicon-32x32.png",
+      "192": "android-chrome-192x192.png"
+  },
+  "permissions": ["activeTab"],
+  "background": {
+    "scripts": ["background.js"],
+    "persistent": false
+  },
+  "browser_action": {
+    "default_icon": {
+      "16": "favicon-16x16.png",
+      "32": "favicon-32x32.png",
+      "192": "android-chrome-192x192.png"
+    }
+  }
+}