Originally Posted by GaRHaR
This is a common problem with firefox believe it or not.
View -> Toolbars -> Bookmarks Toolbar (make sure it's not on).
Cheers for your response, G. The Bookmarks Toolbar
was ticked in View->Toolbars. I've unchecked it now, and it seems to have righted the problem.
Funny enough, my bookmarks were deleted as soon as the vibrating problem started. I've managed to find a solution to get the bookmarks back though.
Again, thanks very much for your help.