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    <p>You can use <a href="https://developer.mozilla.org/en/XPCOM_Interface_Reference/mozIJSSubScriptLoader" rel="nofollow" title="mozIJSSubScriptLoader">mozIJSSubScriptLoader</a> to execute the JavaScript <strong><em>(chrome://myExtension/content/script.js)</em></strong> every time a <a href="https://developer.mozilla.org/en/Code_snippets/On_page_load" rel="nofollow" title="webpage loads">webpage loads</a>. Here is the sample code that you need to modify according to your chrome directory</p> <pre><code>window.addEventListener("load", function load(event){ window.removeEventListener("load", load, false); //remove listener, no longer needed myExtension.init(); },false); var myExtension = { init: function() { var appcontent = document.getElementById("appcontent"); // browser if(appcontent){ appcontent.addEventListener("DOMContentLoaded", myExtension.onPageLoad, true); } var messagepane = document.getElementById("messagepane"); // mail if(messagepane){ messagepane.addEventListener("load", function(event) { myExtension.onPageLoad(event); }, true); } }, onPageLoad: function(aEvent) { var doc = aEvent.originalTarget; // doc is document that triggered "onload" event // do something with the loaded page. // doc.location is a Location object (see below for a link). // You can use it to make your code executed on certain pages only. var loader = Components.classes["@mozilla.org/moz/jssubscript-loader;1"].getService(Components.interfaces.mozIJSSubScriptLoader); loader.loadSubScript("chrome://myExtension/content/script.js", doc); // add event listener for page unload aEvent.originalTarget.defaultView.addEventListener("unload", function(event){ myExtension.onPageUnload(event); }, true); }, onPageUnload: function(aEvent) { // do something } }; </code></pre>
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