Used it for a while, tweaked and addon-ed for maximum speed, yet it was way too slow for me. Besides, the Private Browsing feature is awkward, and I find Safari's Coverflow-history search much better. Back to Safari. (Safari has Glims + Adblock + Keywurl). I'm guessing that it'll take for a new version of Safari to be released in order for Firefox to get as fast as the current version of Safari, as always.