Rated 1 out of 5 stars
Really buggy in FF3b4. Tan bar stays at the top of the screen no matter what. Returning from full screen doesn't work on it's own (You have to go to the desktop or otherwise refresh the whole screen, then go back to Firefox) Sometimes a static image of the status bar stays on the screen and you have to refresh that part of the screen to get it to go away. Menu bar isn't accessible at all in wide screen (it seems like it should pop up at the top of the screen with the tab bar when you put your mouse over there)
Generally inferior to the default fullscreen implementation in the nightlies, except that the status bar in the nightlies doesn't appear when you mouse over a link.