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The Firefox extension Stylish enables customization of a site's CSS. I'd like to use the same extension to make some tweaks to the Firefox GUI. How can I do this?

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  1. Go to this url: chrome://browser/content/browser.xul This loads a page filled with Firefox GUI elements.
  2. Open Tools-> Web Developer-> Inspector.
  3. Inspect the element(s) you want to customize. This then lets you get the IDs and classes of the various elements.
  4. Create a Stylish style that modifies those elements.

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