Hi khaledesheh, thank you for the report. This crash appears to have occurred after you exited Firefox but before it completed its shutdown file maintenance: there is a set time period Firefox will allow for that, and if it doesn't finishes, Firefox "crashes" itself. These shutdown crashes can have multiple causes, and I'm not sure what caused yours. For example, if Firefox had a network connection that it isn't able to close for some reason, or if Firefox stalls cleaning the cache (if you have Firefox set to clear history when it closes). How often do you encounter this problem -- every time you close Firefox? Is there any other pattern to it? As a temporary workaround, you could try keeping at least one Firefox tab open as long as possible so you aren't shutting down as often.