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.

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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