- User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36
It could be something to do with the Accessibility Service. This has been known to cause crashes sometimes.
Try disabling the Accessibility Service and see if the issue continues after you restart Firefox.
Hope this helps.