Firefox 4.01 with multiple tabs/windows open will close with the following dialoog boxes appearing, one for each window, evidently, "invalid preferences extensions.bprivacy.timer check that is listed in defaults/prefs.js"

The cause of the need to revert to the last known good operating condition was trying to download a file from a Yahoo discussion group. The download froze the machine. When Firefox was restarted, it froze on loading, at first step of loading multiple windows and tabs. Many reboots to the same frozen state led to revert to the last restore point. That produced equivalent results on startup of Firefox, the option of F8 and revert to last known good operating condition was done. Everything seemingly operate OK, with the exception of the pop-up dialog boxes on shutdown of Firefox .
Began Thursday 5/26/11
I know locations and dates of all files "prefs.js" but don't know what to do with them, if anything.

I removed add-on BetterPrivacy. No problems since then anymore.
Regards,
HABSBURGER

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Firefox 4.01 with multiple tabs/windows open will close with the following dialoog boxes appearing, one for each window, evidently, "invalid preferences extensions.bprivacy.timer check that is listed in defaults/prefs.js"

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