Firefox is garbage for me personally...I'd rather shoot my eye out. Adblock is pointless if you run a freeware tool like hostsman.
Spyblock is okay but, I hate all the crap it installs and removes. Any browser is only as good as the person using it. Though, I use it ... generally, I only use it when I hit a website that disallows IE9 or other similar services that rely on .net technologies.
And since we are speculating here...I use a hardware firewall, antivirus and sandbox all scripts...but, that doesn't save me from getting disallowed requests from winamp.com.