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If it is not happening to you please tell me how to solve this problem.?
The most common suspect is one of your add-ons. If you have a lot of add-ons, then try starting Firefox from the Windows Start Menu and select the "Mozilla Firefox (Safe Mode)" option. If you have no further crashing problems after doing so, then re-start Firefox in "normal" mode, and go through and manually disable all of your add-ons. Then re-enable them one by one, testing at each step, and see which one is causing the problem.
You could also have a more general problem with your computer, or you may have found a real-but-uncommon bug. The add-ons are the most common cause of problems, though.