Stephen Horlander has released a few mockup images of what would become the update Firefox theme in future releases.
Like the planned Windows theme refresh, updates will happen in two phases:
In Firefox 3.7, expected around mid-next year:
Main changes (in case you don’t notice them):
- combined stop/reload buttons
- tabs hanging from the toolbar
- home button moved to the tab bar
- more rounded tabs
- less rounded buttons
In Firefox 4.0, the most dramatic change is moving the tab bar above the navigation bar, the combination of the location and search bars, and the addition of an identity button to the upper right corner.
You can see more screenshots including some other variations still under consideration, as well as the rationale behind the changes.