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copied!<p>There are so many ways you could do this, so the right choice depends on how you're going about everything else.</p> <p>Here are just a few ways of listening, rather than polling.</p> <ol> <li><p>New Chrome Windows</p> <pre><code>function ChromeWindowObserver() { this.observe = function(subject, topic, data) { // subject is a ChromeWindow } } Components.classes["@mozilla.org/embedcomp/window-watcher;1"] .getService(Components.interfaces.nsIWindowWatcher) .registerNotification(new ChromeWindowObserver()); </code></pre></li> <li><p>New Tabs</p> <pre><code>function tabListener(event) { var browser = gBrowser.getBrowserForTab(event.target): } gBrowser.tabContainer.addEventListener("TabOpen", tabListener, false); </code></pre></li> <li><p><a href="https://developer.mozilla.org/en-US/docs/Observer_Notifications" rel="nofollow">Observer Notifications</a> (my favorite)</p> <pre><code>const dumpObserver = { observe: function(subject, topic, data) { dump(topic + "\n"); } } const domObserver = { observe: function(subject, topic, data) { dump(subject.location + "\n"); } } const ObserverService = Components.classes["@mozilla.org/observer-service;1"] .getService(Components.interfaces.nsIObserverService); /* debug log notifications */ ObserverService.addObserver(dumpObserver, "*", false); /* debug log all new content locations */ ObserverService.addObserver(domObserver, "content-document-global-created", false); </code></pre></li> </ol> <p>Side note, check out <a href="https://developer.mozilla.org/en-US/docs/JavaScript_code_modules/Using" rel="nofollow">JavaScript code modules</a>. I think that might be helpful for you when sharing data between chrome windows.</p>

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