Firefox auto-updated my Windoze machine to 20.0.1 a couple of days ago. Flash and Adobe reader needed updating, other than that its been OK for me. Any specific trouble you are noticing?
I get a 'can't find server' error. I can connect via Internet Exploder, tho. Tried checking for add-in updates, removed all of them one at a time, in combinations and finally en toto. Uninstalled, reinstalled. Feh.