For the past week I have been using
Pale Moon as my default browser (on both Linux and MacOSX), as I have been dissatisfied with Firefox since the move to the "Australis" interface with v.29.
Probably old news to many, and I know it was mentioned quite a bit in the "Browser of the Year" thread, but seriously, if you have been unhappy with the direction of FF, and can't get behind Chrome/Chromium-based browsers, give it a shot. They even have 64-bit versions.