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On first boot of system, I start firefox, about 20 seconds later it turns itself off. There is no crash report generated

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It happens every time at first boot of system. I open Speedfan and then Firefox. Even if I don't open Speedfan, 20 or so seconds later Firefox shuts down. No crash report is generated. I have already tried a clean uninstall and reinstall. After the first crash it works fine on second restart.

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Does it help if you wait a few minutes after booting the computer before starting Firefox or does this event happen if you start Firefox one hour after booting for the first time?

If this only happens immediately after booting the computer then it is possible that your security software needs more time to start up and initialize and blocks Firefox during that time.

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My system is not configured with different profiles or a profile manager, under Web Developer, there is an entry marked Profiler, but it gives me no option to create an alternate or to even modify My current profile, if it exists.

 The secondary response regarding waiting an hour is not really practical.

If I wanted to wait an hour to get on the internet, I think I could just as easily get another browser.

Chrome for example doesn't have this problem.