Try to check the add-ons you have installed because it might be possible that it was not Firefox after all which was allegedly responsible for the crash. Most of the addons at Mozilla are tested and approved. But the vicious mix of addons brings in new angles to the story. Two perfectly stable addons could create issues when used in tandem. Additionally thereâ€s a list of addons with known problems.
 
1)A9 Toolbar - Causes unresponsive warning
2)Adblock Plus - Can interfere with flash content, most often on MAC OS
3)All-in-one gesture - Can cause firefox crashes. Also conflicts reported with spellchecker in Linux Mac OSX versions.
 
>>> more list of addons with problems
 
>>> Step by step on removing error of Firefox add-ons
 
So try using Firefox with these addons disabled.

Start with the tool bars and add ons. My Skype add on usually crashes or causing some problems. Or try another browser. Haven't been having errors with Chrome and Safari.

Download the Latest version of Firefox Browser