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Firefox constantly crashing

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How do I get all parts of Firefox off my hard drive so I can reinstall an older version? Now that I've had 3.6.6, 3.6.7 and 3.6.8 on my MacBook running OS 10.6.4, ALL versions are still crashing. Furthermore, now that I reinstalled 3.5.11, it, too now crashes periodically, though not continually.

How do I get all parts of Firefox off my hard drive so I can reinstall an older version? Now that I've had 3.6.6, 3.6.7 and 3.6.8 on my MacBook running OS 10.6.4, ALL versions are still crashing. Furthermore, now that I reinstalled 3.5.11, it, too now crashes periodically, though not continually.

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i dont have any other versions installed - firefox just wont open under 10.6.4

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Over the last few versions Firefox has become very unstable. With 3.6.8 it crashes constantly!!