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    <p>The answer right now is "mostly".</p> <p>Basic stuff works, including selecting, deleting and finding. I use 1.5.2 pretty heavily both inside an extension and on content pages from the extension.</p> <p>$.ready() also doesn't work because jQuery assumes and waits for a body. This is the <a href="https://github.com/jquery/jquery/commit/262fcf7b7b919da1564509f621cf7480a5d5572b" rel="nofollow">commit</a> that broke it.</p> <p>Some stuff doesn't work because, as @Daniel describes, jQuery's doesn't properly detect what it can and can't do in XUL (more background below). From stepping through jQuery code I have have found you need at least the following lines in your own code.</p> <pre><code>// Workarounds for jQuery not properly testing support in XUL environment // These are done at jQuery init // This is actually critical, otherwise elements are not properly removed from the cache and you get a cache[id] is undefined crowdmash.$.support.deleteExpando = true; // These are done at ready(), but jQuery never fires ready in XUL // XUL doesn't seem to support offsetWidth and offsetHeight (without this :hidden is broken which breaks fadeIn) crowdmash.$.support.reliableHiddenOffsets = false; crowdmash.$.support.opacity = true; </code></pre> <p>If you want to use jQuery on a content page from an extension, see my <a href="http://forums.mozillazine.org/viewtopic.php?f=19&amp;t=2105087" rel="nofollow">tips</a>.</p> <p><a href="https://github.com/ilyakharlamov/jquery-xul/wiki" rel="nofollow">jquery-xul</a> modifies 1.4.4 to better work with XUL. I have not tried it yet, but from looking at its changes it does look like fixes the ready issue. I don't know if it fixes the support issue .</p> <p>As background on the $.support issue. The problem is that jQuery's feature detection creates a and then populates it using innerHTML. XUL divs do not support innerHTML, so the support code fails marking nothing as supported. There is actually a ticket on this that is open and being discussed for 1.7 - <a href="http://bugs.jquery.com/ticket/5206" rel="nofollow">http://bugs.jquery.com/ticket/5206</a>.</p>
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