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This feature is new in Firefox 34.

From Firefox 34 onwards, you can point the developer tools at a specific iframe within a document.

You'll see a button in the toolbar:

Click it, and you'll see a popup listing all the iframes in the document, as well as the main document itself.

Note that at the moment you'll need to reload the page or close and reopen the developer tools in order to see the popup. This is being tracked as bug 1062233.

If you select an entry in the list, all the tools in the toolbox - the Inspector, the Console, the Debugger and so on - will now target only that iframe, and will essentially behave as if the rest of the page does not exist.

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