I've not seen anything like that on my 7390 machine (although, I only boot into Windows occasionally on that machine, so it might be unlikely for me to see it). If you open the Event Viewer [1] can you find any Error event logs from when Firefox has crashed? (it can sometimes be tricky to find them, as the system records a lot of different event types). If there are any Firefox crash entries in there, they might contain some relevant information (such as DLL the crash occurred in) that could give us some clues to which piece of code is crashing.
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I've not seen anything like that on my 7390 machine (although, I only boot into Windows occasionally on that machine, so it might be unlikely for me to see it). If you open the Event Viewer [1] can you find any Error event logs from when Firefox has crashed? (it can sometimes be tricky to find them, as the system records a lot of different event types). If there are any Firefox crash entries in there, they might contain some relevant information (such as DLL the crash occurred in) that could give us some clues to which piece of code is crashing. [1] https://www.howtogeek.com/123646/htg-explains-what-the-windows-event-viewer-is-and-how-you-can-use-it/