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copied!<p>First, a general debugging tip, then a stab at your problem.</p> <p>Remember that Greasemonkey scripts are just javascript, and you can still use all the Javascript tools avaiable to you to debug your problem. Open up gmail, fire up <a href="http://www.getfirebug.com" rel="nofollow noreferrer">Firebug</a>, and try running your javascript code directly on the command line (click the upward circle arrow to the right of the console line for a bigger typing area).</p> <p>When I did the above with your javascript snippet, allLinks.snapshotLength was evaluating to 0, indicating that your xpath expression didn't match anything. This is odd, because when I used <a href="https://addons.mozilla.org/en-US/firefox/addon/1095" rel="nofollow noreferrer">XPath Checker</a>, it matched the logo. </p> <p>Digging in a bit deeper, it looks like gmail's main document is a number of iframes, and the iframes contain the actual application elements. Specifically, there's a frame with an ID of "canvas_frame" which contains the actual DOM for the application interface. When I try </p> <pre><code>canvas = window.frames[document.getElementById('canvas_frame').name].document; allLinks = canvas.evaluate( "//html/body/div[1]/div/div/div[1]/div/div[3]/div[1]/div[2]/div[2]/div[1]/div[1]", canvas, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null); </code></pre> <p>I get a response with a length of 1, which may suit your needs better.</p> <p>Finally, this isn't required, but your xPath expression looks a little fragile. If gmail changes the document structure even slightly (say, with a wrapper div), your program will break. Consider something like this instead.</p> <pre><code> //div[contains(./h1,"Gmail Logo")] </code></pre>

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