Currently the top reasons for firefox crashing are * malware see [[is my firefox problem a result of malware]] * the software IDvault (Comcast often supplies this) do you have it ? I note you were you able to obtain a Crash ID, [https://crash-stats.mozilla.com/report/index/c6780fea-930c-4b8c-8225-ccfac2110924 c6780fea-930c-4b8c-8225-ccfac2110924] & that gives signature [https://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=exact&query=nsStandardURL%3A%3ASchemeIs%28char%20const%2A%2C%20int%2A%29&reason_type=contains&date=09%2F24%2F2011%2007%3A42%3A31&range_value=1&range_unit=weeks&hang_type=any&process_type=any&do_query=1&signature=nsStandardURL%3A%3ASchemeIs%28char%20const%2A%2C%20int%2A%29 [nsStandardURL::SchemeIs(char const*, int*)]] * see also [[firefox crashes]] There is a strong probability that the crash is caused by a particular Trojan malware. You will need to use up-to-date AV or malware detection tools or applications, and as a Windows user may find MS provide suitable free software. If you upgrade to Firefox 7 the browser may stop crashing, but you will still have security problems and risks until you identify and remove the malware.