If Firefox has a flaw to get bummed about, it's that it slows down your machine after a few hours of steady computing. Digital Inspiration has a workaround for this that does not include any sort of restart reinstalling:
Start Firefox and export your bookmarks as a file on your hard-drive (we'll need them later).
Type firefox.exe - P in the Run box of Windows.
Click the Create Profile button without making any modifications to your existing profile (which is normally called "default")