When in fullscreen mode, bottom of Firefox window ends where Windows Taskbar would be, were it not in autohide mode.

Firefox version: 4
Windows Version: XP-SP3 (automatic updates)
My Windows Taskbar is in autohide mode.
When I launch Firefox in windowed mode and maximize the window, it takes up the entire screen.
When I move my mouse pointer to the bottom of the screen, the Windows Taskbar pops up.
When I select Fullscreen mode in Firefox, the top of the window behaves as it should: Menus disappear, and the toolbar area autohides, reappearing when I move my mouse pointer to the top of the screen.
The bottom of the Firefox window, however, jumps up to where it would be if the Windows Taskbar were not in autohide mode, leaving a black space. While I can move my cursor over this black space, when I reach the bottom of the screen, the Windows taskbar will not unhide, forcing me to use the Windows button if I want to execute some other command.
If I minimize the Firefox window, then select it from the taskbar, it returns to fullsceen mode and takes up the entire screen (no more black space), but I still cannot get the Windows Taskbar to pop up by moving my cursor to the bottom of the screen.
While it may seem nit-picky, this is a dealbraker for me. I set Firefox to run in Fullscreen mode, and expect it to do so properly, without having to go through all of these steps. Furthermore, since I use Windows Start button for everything (my desktop has nothing on it but the Recycle Bin), I often use it while browsing (launching other applications, using the Control Panel, or looking through filesystem, among others).
I am extremely pleased with all other aspects of the browser, right down to the toolbar area not disappearing when my mouse pointer happens to slide off of it after I place my cursor in the search box, and while I would be sad to lose all of these improvements, I will return to Version 3 if I must.
Thank you very much for your time.
~David Morrissey~

I'm sorry, it seems I spoke too soon. The original problem is back: Black stripe at the bottom of the screen. :-(

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