I had to revert to 3.6.16. FF4 stopped responding several times in the middle of surfing. Web pages would load, then stop and I would have to shut it down and restart. Then I would get a message from FF stating they were embarrassed they could not reload my last pages and give the option of trying again or starting a new session. FF would fail if I chose reload the pages, and start successfully if I chose new session. After doing this several times I gave up and downloaded the old FF3 version that is working well.
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