Latest FireFox Update Breaks VIsual Editor

As of the Firefox 10.0.2 Firefox update (Windows) the visual editor in New post screen is no longer available. I ran Firefox in safe mode and still had no visual editor. I then accessed the New post screen with Internet Explorer and the visual editor was available.

So this seems to be a problem with Firefox itself? Any suggestions?

This is the second problem with Firefox in the last 3 weeks. The previous version broke the Disqus admin panel. Disqus said it was a bug in Firefox which was fixed with the latest update.