I typically keep many windows with several tabs open. It is possible that this causes more crashes since the number of pages multiplies any effect most users with less pages/tabs would experience. I have been having problems with Firefox crashing Using the windows task manager I have looked into this issue monitoring lots of variables. Bottom line the crash is caused by increasing memory usage possibly caused by the flash add on which is doing many IO reads on at least one offending page/tab. Could some sites be using flash to read from my disk without permission and there is a memory leak in either flash of the code the sites uses? I have searched the web for a task manager like add-on for Firefox tabs that would allow me to determine the offending page/tab/add-on/extension. It seems like a great idea which has not been implemented. Since I am a developer I would be happy to implement, but would like some guidance since my knowledge of your product is only at the user level.