Running W7 Ultiate 32 & 64 bits, FF v21 and the latest v22 have both been acting up lately, and Flash crashing, frozen on its track on my laptop, netbook & desktop. In a pinch, I would use IE 10.0 if I must, otherwise, Chrome will do - disabled the tracking, add-ons and tweak the settings and w/o logging into G+ account so basically incognito mode.