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copied!<p>Documentation: <a href="http://code.google.com/chrome/extensions/getstarted.html" rel="nofollow">http://code.google.com/chrome/extensions/getstarted.html</a><br> Samples: <a href="http://code.google.com/chrome/extensions/samples.html" rel="nofollow">http://code.google.com/chrome/extensions/samples.html</a></p> <p>This is the official documentation and sample code for Google Chrome extensions. In your <a href="http://code.google.com/chrome/extensions/manifest.html" rel="nofollow">manifest</a> you want to declare a popup for either a page or browser action (whichever best suites your extension). In your popup HTML file you probably want something like the following;</p> <pre><code><!DOCTYPE HTML> <html> <head> <script type="text/javascript"> function initPopup() { chrome.tabs.getSelected(null, function (tab) { document.body.appendChild(document.createTextNode(tab.url)); }); } </script> </head> <body onload="initPopup();"></body> </html> </code></pre> <p>This very simply appends the URL of the selected tab to the body of the popup.</p> <p>Your manifest should look like the following;</p> <pre><code>{ "name": "My First Extension", "version": "1.0", "description": "The first extension that I made.", "browser_action": { "default_icon": "icon.png", "default_popup": "popup.html" }, "permissions": [ "tabs" ] } </code></pre> <p>The file structure for this example is a single folder containing <code>manifest.json</code>, <code>popup.html</code> and <code>icon.png</code>.</p> <p>On the Extensions page (chrome://extensions) you should click <em>Load unpacked extension...</em> and navigate to this folder. If you make any changes to the manifest be sure to click the <em>Reload</em> link to pick up these changes.</p> <p>I hope this helps but I strongly suggest reading through the documentation I mentioned above to get a better understanding of what you're doing.</p> <p><strong>EDIT:</strong> Added missing <code>null</code> argument to code and included an example manifest and file structure based on additional information gathered from comments.</p>

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