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Page Inspector — Firefox Source Docs documentation
Firefox Source Docs
Page Inspector
Use the Page Inspector to examine and modify the HTML and CSS of a page.
You can examine pages loaded in the local copy of Firefox or in a remote target such as Firefox for Android. See about debugging
User Interface Tour
To find your way around the Inspector, here’s a quick tour of the UI
You can split the Rules view out into its own pane, separate from the other tabs on the CSS pane — this is called 3-pane mode
How to
To find out what you can do with the Inspector, see the following how to guides:
