Pop-up blocking functionality for Chrome

popupBlocker.js

Index: popupBlocker.js
===================================================================
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+/*
+ * This file is part of the Adblock Plus extension,
+ * Copyright (C) 2006-2012 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+var tabsLoading = {};
+
+chrome.tabs.onCreated.addListener(function(tab)
+{
+  if (!("openerTabId" in tab))
+  {
+    // This isn't a pop-up
+    return;
+  }
+
+  if (isFrameWhitelisted(tab.openerTabId, 0))
+    return;
+
+  var openerUrl = getFrameUrl(tab.openerTabId, 0);
+  if (!openerUrl)
+  {
+    // We don't know the opener tab
+    return;
+  }
+  tabsLoading[tab.id] = openerUrl;
+
+  checkPotentialPopup(tab, openerUrl);
+});
+
+chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab)
+{
+  if (!(tabId in tabsLoading))
+  {
+    // Not a pop-up we've previously seen
+    return;
+  }
+
+  if ("url" in changeInfo)
+    checkPotentialPopup(tab, tabsLoading[tabId]);
+
+  if ("status" in changeInfo && changeInfo.status == "complete")
+    delete tabsLoading[tabId];
+});
+
+
+function checkPotentialPopup(tab)
+{
+  var requestHost = extractHostFromURL(tab.url);
+  var documentHost = extractHostFromURL(tabsLoading[tab.id]);
+  var thirdParty = isThirdParty(requestHost, documentHost);
+  var filter = defaultMatcher.matchesAny(tab.url || "about:blank", "POPUP", documentHost, thirdParty);
+  if (filter instanceof BlockingFilter)
+    chrome.tabs.remove(tab.id);
+}