Okay, so The Guru made a minor observation error with the Firefox 7 Nightly UI post. However, as a result of this post a reader posted a userChrome.css tweak that will allow you have your tabs on the very top even if your window is not maximized. Tabs in between the Firefox Button and Window Size controls on a non-maximized browser window on Firefox 6 Aurora build (6.0a2). For information on how to modify you userChrome.css file see the UserChrome.css section on our Wiki’s Tweaks page. Add these lines of code to your userChrome.css file: /*Setting FF4′s Tabs to Always…

Just as was the change in Firefox 7.0 Nightly, the entry extensions.checkCompatibility.7.0a will not work with the new Thunderbird 7 nightly. To disable the compatibility checking add the following Boolean entry and set it to false: extensions.checkCompatibility.nightly This only works for Thunderbird 7 Nightly builds.