Only a few days after releasing mock-up’s for Firefox 3.7, Mozilla has released some mock-ups for Firefox 4.0 – https://wiki.mozilla.org/Firefox/4.0_Windows_Theme_Mockups.
It quite reasonably states that they are “NOT FINAL! THEY ARE ONLY FOR BRAINSTORMING/EXPLORATION”.
The example tab layout below gives some idea of the thought process, and you might think the ‘Tabs on Top’ option looks very much like Google Chrome.
Tabs on Bottom
Tabs on Top
For a full list of browsers supported by the Cloud Testing functional website testing service, visit the Cloud Testing website at www.cloudtesting.com.
Posted by Phil Smith - Cloud Testing 
