The main thing Firefox need to do is drop the version numbers all together. These numbers should be for developer's only. I could even argue developers do not need the version numbers and could work just fine with feature detection.
The fact is that most people do not care what version of Firefox they have. All they want is Firefox Latest. The latest and hopefully best version of Firefox will allow for the fastest and smoothest browsing experience. When I hear FF7/8/9 is out I sigh. Firefox automatically updates now, why all the grand announcements, especially considering for the majority of users the changes between 7 and 8 are fairly irrelevant background changes that won't be noticed.
Chrome is on what now? v15? Does Chrome continuously shout about how version 15 is out? No.. it just updates.. the user doesn't really know about it. The user doesn't really care about it.
Please.. just call the damn product [Firefox - no version number on the end] and be done with it.