For everyone looking for the sane release of Firefox you want "Extended Support Release [mozilla.org]" which Mozilla considers crazy zombie mutants from outer-space with an "deathly long" life span of 54 weeks instead of 42 days. I've been using it after I upgraded from Firefox 8 after Firefox 10 was released.
I know code, I have a reasonable understanding of whats going on int he browser world...not extremist amount though enough to make most people here nervous to go on Jeopardy with me and talk tech and frankly the work getting in to each version of Firefox has been a total joke. Some of these releases are so bad that the only added "feature" was a bigger version number.
Oh and as someone who files bugs for Gecko/Firefox there is a LOT of resistance to user-oriented decisions, Mozilla has officially become a corporate entity that is completely out of touch with what normal people want. Heck, they can't even do things right with me and I'm highly technical (a lot of us are here of course).
I plan on eventually putting together a version of Firefox which will attempt to undo all the damage done to Firefox.