Yes, the PR indicator is nice but it requires FF 0.9 so I downloaded and installed it...... I hate seeing things get worse. The icons on 0.8 were nicer, I liked the animation top right on 0.8 but worst of all, 0.9 opens in geological time. It takes four times as long to load compared to IE. OK, so I'm using an old and slow computer, but that ain't right.
My guess - 0.9 stores more data in the registry - that really slows things down!
If you installed 0.9 without fully uninstalling 0.8 you can end up with issues including slow-downs. A clean install can solve most of those.