Important: This is an old post. If you are using Firefox 4 Beta 7+, head over to a newer post with IMPROVED solution.
Mozilla has done a brilliant job with Firefox 4, removing all the clutter and making the UI sleek and trendy. You notice that the UI designers have thoughtfully utilized the screen real estate by providing more space for the actual web content. But there’s always a scope for improvement, or so they say. With a little bit of tweaking, the title bar can be done away with to claim more space for the web content.

All you have to do is to download this CSS file (Right-click > Save Link As…) [userChrome.css] and paste it into this folder [If by any chance there's already a file with the same name, replace it.]–
[Windows Vista/7] C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\chrome
[Windows XP] C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\<profile>\chrome\
Now start Firefox 4 and enjoy the trimmed down version. Do note that, you need to have ‘Tabs on Top’ enabled for this to take effect. This is the modified (and working) version of the tip shown here.
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