I got it as part of the ubuntu updates but it doesn't seem to like my usercontent.css file and, for example, instead of the gray boxes saying "click to play" which replace the flash animations, it shows nothing, so I can't go to any site that uses flash in a essential way, such as youtube. If I can't fix it, I'll have to downgrade. I tried FF3 in beta and had the same issue and decided to downgrade and wait for the official release but no luck. Any suggestions are welcome.