Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
2012 was one of the busiest year's ever for the Mozilla's Firefox project. This is the first full year for Mozilla's rapid release cycle which debuted in 2011. I have to admit that last year I was among those that didn't think that the new cycle would work, but after 2012 it's clear that the rapid release system can work extremely well.
During 2012 Mozilla landed a staggering 7 major version releases of Firefox.
The first Firefox release of 2012 was Firefox 10, which debuted at the end of January. From my perspective, the most interesting addition in that release was the Inspect Tool which in my daily usage has now replaced my usage of 'view source'.