Firefox has been extremely annoying on an XP machine with it's constant crash reports requiring uninstall and reinstall several times till it starts working again. However, periodically repairing Firefox was worth the headache for the benefit of Firefox’s performance. Mozilla Firefox 4.0 Beta 8 was installed hoping it contained the fix for the crash report problem; it didn't. BUT, the new crash report post-mortum file list provides another means to identify a probable cause. The file list was discovered after about the third crash and it was noted that Firefox was attempting to load an internet filter dll file from C:\WINDOWS\SYSTEM instead of C:\WINDOWS\SYSTEM32 which had the correct version. Evidently, the internet filter program update placed the newer version dll in C:\WINDOWS\SYSTEM32 and did nothing with the older version dll in C:\WINDOWS\SYSTEM or the registry mapping. A copy of the newer version dll was placed in C:\WINDOWS\SYSTEM and it has been smooth sailing with Firefox ever since. Thanks for adding the post –mortum file list; it provided a means to identify and fix the problem. Firefox is working great and the snail’s pace Internet Explorer 8 has been retired. Thanks again!