I love Firefox, but since I upgraded from 28 to 29, it has been crashing for me on Win 7 on a daily basis. Looking in about:crashes I have close to 30 crashes reported. The moment I upgraded to 30, it crashed. sigh
Hopefully it will be fixed soon (if not already)
This happened on both OSX and Ubuntu(my laptop and workstation) at the same time when Firefox 28 was introduced.
If you would rather not do that in public, please feel free to e-mail me links: bzbarsky at mit dot edu.