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    <p>Like lwburk, I don't think its available through Mozilla's API's, but I have an idea which works, but it seems like a complex hack. The basic steps are:</p> <ol> <li>Set up a custom resource url to point to your extension's base directory</li> <li>Read the file and parse it into XML</li> <li>Pull the id out using <a href="https://developer.mozilla.org/en/xpath" rel="nofollow">XPath</a></li> </ol> <p>Add the following line to your chrome.manifest file</p> <pre><code>resource packagename-base-dir chrome/../ </code></pre> <p>Then we can grab and parse the file with the following code:</p> <pre><code>function myId(){ var req = new XMLHttpRequest(); // synchronous request req.open('GET', "resource://packagename-base-dir/install.rdf", false); req.send(null); if( req.status !== 0){ throw("file not found"); } var data = req.responseText; // this is so that we can query xpath with namespaces var nsResolver = function(prefix){ var ns = { "rdf" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#", "em" : "http://www.mozilla.org/2004/em-rdf#" }; return ns[prefix] || null; }; var parser = CCIN("@mozilla.org/xmlextras/domparser;1", Ci.nsIDOMParser); var doc = parser.parseFromString(data, "text/xml"); // you might have to change this xpath expression a bit to fit your setup var myExtId = doc.evaluate("//em:targetApplication//em:id", doc, nsResolver, Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE, null); return myExtId.singleNodeValue.textContent; } </code></pre> <p>I chose to use a XMLHttpRequest(as opposed to simply reading from a file) to retrieve the contents since in Firefox 4, extensions aren't necessarily unzipped. However, XMLHttpRequest will still work if the extension remains packed (haven't tested this, but have read about it).</p> <p>Please note that resource URL's are shared by all installed extensions, so if <code>packagename-base-dir</code> isn't unique, you'll run into problems. You might be able to leverage <a href="https://developer.mozilla.org/en/JavaScript_code_modules/Using#Programmatically_adding_aliases" rel="nofollow">Programmatically adding aliases</a> to solve this problem.</p> <p><em>This question prompted me to join StackOverflow tonight, and I'm looking forward participating more... I'll be seeing you guys around!</em></p>
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