Just do one thing update the firefox to 33.1.1 it has fixed start up crash.. Steps to update Click on menu Open help menu ( ? ) this icon will be there Select About firefox It will automatically update the browser..

Image showing whats new in 33.1.1

Update your Flash Player v15.0.0.223 http://get.adobe.com/flashplayer/

Thanks Md Shahbaz Alam for your reply. Yes I updated it to 33.1.1 but the problem still exist but it's less than before

Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.