It does one of these:
I'm using IE now.
Wow, I've never seen that flying window animation before. I assume you do not have a multi-monitor setup so there's no reason for the Firefox window to be off-screen to the right.
Can you tell from the Task Bar tile/button whether Firefox is the active application? If so, could you try the trick described in this thread and see whether it works for you: When I go to open firefox it shows up on my tool bar but not on my screen where is it?
I followed the second order of steps (deleting the localstore.rdf file) and all it did was this:
Could you try "moving" the window to the left? Here's how:
With a Firefox window active (judging from the task bar or Alt+Tab):
IT WORKED, THANK YOU SO MUCH.