WTF is wrong with Firefox?

I'd never thought I'd be complaining about the performance of firefox but my browser has been acting very unstable since 3.0.3 and it hasn't improved much with 3.0.4...

The last few days, it's been crashing every few hours. Also refused to save new bookmarks, for which I had to google and dig into the scripts to fix. This morning when I check my IJ, it is seriously messing up the layout despite working fine yesterday. Gyah.

I don't want to have to switch back to IE... T_T

EDIT: Actually, I take the part about IJ back. Just tried viewing it with IE and it looks messed up too. Did IJ change something?