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    <p>What you see is expected behavior.</p> <blockquote> <p>Content scripts execute in a special environment called an isolated world. They <strong>have access to the DOM of the page</strong> they are injected into, but <strong>not to any JavaScript variables or functions created by the page</strong>. It looks to each content script as if there is no other JavaScript executing on the page it is running on. The same is true in reverse: JavaScript running on the page cannot call any functions or access any variables defined by content scripts.</p> </blockquote> <p><a href="http://developer.chrome.com/extensions/content_scripts.html#execution-environment" rel="nofollow">http://developer.chrome.com/extensions/content_scripts.html#execution-environment</a></p> <p>When you run <code>console.info(myVar);</code> from the page, the console of Chrome dev tools or from the injected script, it runs in the context of the page and thus sees the variable as defined.</p> <p>However, when running the same code from inside of your extension code, you're operating in a completely different environment, so <code>myVar</code> is undefined.</p> <p>You can work around this using shared DOM perhaps.<br> <a href="http://developer.chrome.com/extensions/content_scripts.html#host-page-communication" rel="nofollow">http://developer.chrome.com/extensions/content_scripts.html#host-page-communication</a></p> <h2>EDIT</h2> <p>Unless someone corrects me, the <code>console.info(myVar);</code> code below is injected into <code>script</code> element while still being executed in the context of the extension:</p> <pre><code>$("&lt;script /&gt;", { html: "console.info(myVar);" // myVar points to extension's myVar, not page's }); </code></pre> <p>A simple test can be run by logging <code>chrome.extension</code> object or declaring <code>myVar</code> inside of the contentscript – the <code>chrome.extension</code> will be available and <code>myVar</code> will be logged exactly as defined in the contentscript.</p> <p>The suggestion is to use an external script (which is also better for modularity), add it to <code>web_accessible_resources</code> and create a <code>script</code> element with a <code>src</code> property pointing to that external script.</p> <p>The example extension code below alerts "test" when loading the test.html page with extension enabled.</p> <p><strong>manifest.json</strong></p> <pre><code>{ "name": "Test", "version": "0.1.0", "manifest_version": 2, "description": "Just a test.", "content_scripts": [{ "matches": ["&lt;all_urls&gt;"], "js": ["contentscript.js"] }], "web_accessible_resources": [ "myscript.js" ] } </code></pre> <p><strong>test.html</strong> (the visited page)</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;script&gt; window.test = 'test'; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>contentscript.js</strong></p> <pre><code>var script = document.createElement('script'); script.type = 'text/javascript'; script.src = chrome.extension.getURL('myscript.js'); document.getElementsByTagName('head')[0].appendChild(script); </code></pre> <p><strong>myscript.js</strong> (this is the external script that will run in the context of the page)</p> <pre><code>alert(window.test); </code></pre>
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    1. POchrome extension throws "not defined" on defined variable
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    1. CODoesn't explain why the injected script tag can't see the pages variable, even though it is executed in the pages context - injecting it through the dev tools works fine though. See my edit above
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    2. CODo you have jQuery in your manifest.json?
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    3. COYes. Plus the page itself ships jQuery too
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