User Agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0 Build ID: 20110615151330 Steps to reproduce: I will leave Firefox open over night with a large number of tabs open. Actual results: When I unlock my computer in the morning I'm greeted with the Firefox crash reporter. Firefox crashes on almost a daily basis with this issue. I can't tell if somehow it starts consuming large amounts of memory at night and then crashes or what. Expected results: Firefox should not be crashing just sitting open unused.

Does the issue still occur if you start Firefox in Safe Mode? https://support.mozilla.com/en-US/kb/Safe+Mode Please post the related Report IDs from about:crashes. https://developer.mozilla.org/en/How_to_get_a_stacktrace_for_a_bug_report

I don't normally run Firefox in Safemode all day because I use Flash (for Pandora) and Firebug all day long. Is that the only way to test this issues? Here are several crash ids: bp-396a09ef-1feb-4235-9256-353192110811 bp-ec48312b-8852-4028-b6f8-cc5662110810 bp-d3484ed9-0f15-4e15-b768-7a43b2110809 bp-7ae65cac-48ac-423f-9f73-f28ab2110808 bp-51a5de59-093c-48fc-908d-0daba2110804 bp-f24eea7a-39f0-47f9-babe-346022110729

This should be fixed in Firefox 7. See Bug 656120 and Bug 661527. Comment if you do not think this covers your problem. See if Firefox gets killed because it allocates more than 2GB on Win 32bit.