As soon as Firefox 3.0 have been officially released, i downloaded and installed it. But i have many complains on this new version. It consumes more than 50% resources on PC, and crashed 3-5 times a day. Especially when working with heavy ajax applications like Google Spreadsheet, or similar. I have sent multiple crash reports to Firefox team, and hoping that they are working on it.
Planning to move back to FF 2.0