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    <p>There's generally no direct way of accessing a different-origin <code>window</code> object. If you want to <em>securely</em> communicate between content scripts in different frames, you have to send a message to the background page which in turn sends the message back to the tab.</p> <p>Here is an example:</p> <p>Part of <code>manifest.json</code>:</p> <pre><code>"background": {"scripts":["bg.js"]}, "content_scripts": [ {"js": ["main.js"], "matches": ["&lt;all_urls&gt;"]}, {"js": ["sub.js"], "matches": ["&lt;all_urls&gt;"], "all_frames":true} ] </code></pre> <p><code>main.js</code>:</p> <pre><code>var isTop = true; chrome.runtime.onMessage.addListener(function(details) { alert('Message from frame: ' + details.data); }); </code></pre> <p><code>sub.js</code>:</p> <pre><code>if (!window.isTop) { // true or undefined // do something... var data = 'test'; // Send message to top frame, for example: chrome.runtime.sendMessage({sendBack:true, data:data}); } </code></pre> <p>Background script 'bg.js':</p> <pre><code>chrome.runtime.onMessage.addListener(function(message, sender) { if (message.sendBack) { chrome.tabs.sendMessage(sender.tab.id, message.data); } }); </code></pre> <p>An alternative method is to use <code>chrome.tabs.executeScript</code> in <code>bg.js</code> to trigger a function in the main content script.</p> <h2>Relevant documentation</h2> <ul> <li><a href="https://developer.chrome.com/extensions/messaging" rel="noreferrer">Message passing</a> <sup><a href="https://developer.chrome.com/extensions/runtime#method-sendMessage" rel="noreferrer"><code>c.runtime.sendMessage</code></a> / <a href="https://developer.chrome.com/extensions/tabs#method-sendMessage" rel="noreferrer"><code>c.tabs.sendMessage</code></a> / <a href="https://developer.chrome.com/extensions/runtime#event-onMessage" rel="noreferrer"><code>c.runtime.onMessage</code></a></sup></li> <li><a href="https://developer.chrome.com/extensions/runtime#type-MessageSender" rel="noreferrer"><code>MessageSender</code></a> and <a href="https://developer.chrome.com/extensions/tabs#type-Tab" rel="noreferrer"><code>Tab</code></a> types.</li> <li><a href="https://developer.chrome.com/extensions/content_scripts" rel="noreferrer">Content scripts</a></li> <li><a href="https://developer.chrome.com/extensions/tabs#method-executeScript" rel="noreferrer"><code>chrome.tabs.executeScript</code></a></li> </ul>
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    1. COYour statement "There's no way to access any of the window objects of a page." doesn't seem to be completely accurate. I just created a basic extension and I am able to access window.frames and get full DOM access to frames on the same origin. Perhaps this has changed since you wrote your answer? It seems perhaps this is still in development and is not fully documented. See: https://code.google.com/p/chromium/issues/detail?id=20773
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    2. CO@kzahel At the time of writing, `window.frames[i]` for all `i`s was undefined. This has indeed been fixed for a while. However, the Same origin policy still applies, so the answer is still valid, at least for the asked question (where the OP was encountering problems with cross-domain frame access).
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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