[improved in Beta 2!] Firefox 3 Beta 2 includes approximately 900 improvements over the previous beta, including fixes for stability, performance, memory usage, platform enhancements and user interface improvements. Many of these improvements were based on community feedback from the previous beta.
Seems to be running fine here installed under Returnil.
Only have 4 addons with only Smiley Xtra being incompatible.
Noscript, Adblockplus and Yahoo Mail Notifier seem to be working OK.
As for mem usage it seems to be using just as much as the last version.
Speed is too hard to judge on this machine but it doesn't seem to be any slower.
Probably won't reinstall after I reboot out of Returnil mode but it is quite usable.
Any body that wants to try this without messing with your current install just download the portable version from here http://portableapps.com/news/2007-12-19_-_...rtable_3_beta_2. Everything goes into one folder and does not mess with your profile from your current version. I have been using the previous beta like this for a while and plan to keep using the all the betas like this.