What’s New Portable edition has been also provided since now. It will create a profile folder “Firefox (Profile)” if needed. Firefox 3.1 becomes 3.5, hence the previous build was Firefox 3.1b3 Use P2 If in doubt Mozilla Firefox 3.5b4 Official Release Notes Firefox 3.5 is based on the Gecko 1.9.1 rendering platform, which has been under development for the past 9 months. Firefox 3.5 is an increment