My Firefox doesn't look like yours so you probably have plugins of some sort, try to completly uninstall Firefox by the control pannel, then delete the folder and then install the new version.
I've been having a problem too where Firefox just crashes with no Windows Report thing. I've been trying to download the V-Dub commercials because they make my anus giggle.
I got that problem too before, but it is very unusual. I think the problem disappeared of itself for me after 1 day or another(tried restarting comp?) or just delete all of your cookies.