Want to change up how you use Firefox? Some other browsers did the whole “tabs on the bottom” thing – and yes, Firefox can even pull off this trick with a little hacking around with the UserChrome.css file.

Here is what you need to add to your UserChrome.css file to get this to work:
/* Display …

You have not earned your Firefox “street credit” if you haven’t ever messed with your userChrome.css file. Come on, all the cool kids are doing it.

Edits to your Firefox profile’s userChrome.css file can make all sorts of fun and useful changes to the fox’s chrome, menus, dialogs and toolbars.

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