I've seen this happen when I've had an extension get 'stuck' somehow. See if you have one that's persistently claiming that it will be upgraded when firefox restarts, and remove it, restart FF, and reinstall it. I think that's what fixed it for me, it's possible your problem is different.
I've seen this happen when I've had an extension get 'stuck' somehow. See if you have one that's persistently claiming that it will be upgraded when firefox restarts, and remove it, restart FF, and reinstall it. I think that's what fixed it for me, it's possible your problem is different.