I've upgraded to Firefox 4.0, with the reboot of the ScribeFire blog editor, ScribeFire 1.5.1. All I have to say about ScribeFire is that if you are NOT using it for blogging, you are seriously missing out. Wow, this is a great program!
Yes, I'm talking about blogging software - but seriously, this is Great Stuff here! If you blog, get this software. It's open source - so it won't cost you anything.