firefox 3.6 personas, plugin updates, full screen video, CSS gradients, js ctypes, more responsive, more stable, faster, WinCE, Maemo
firefox 3.7 weave, tab management, new theme, animation, out of process plugins, more responsive, more stable, faster, Android?
firefox 4.0 jetpack, new UI, task based browsing, content creation tools, process separation, more responsive, more stable, faster
firefox 4.1 … more responsive, more stable, faster
source: mike beltzner
