Firefox closes unexpected when internet connect is lost or changed.
This was originally happening with the ESR version of Firefox (I can't remember the version number. I have since downloaded and installed the latest release, currently on 75.0 (64 bit).
The problem is that whenever my internet connect changes, such us unplugging Ethernet , disconnecting from a Wireless network or connecting to my organization's VPN, Firefox closes unexpectedly. There are no error messages, and it does not generate a crash report.
The problem was consistently replicable on the ESR, and then seemed to go away for a day or two after I installed 75.0 but now is back to being very consistent.
I have tried a refresh, and tried running in safe mode, and the problem persists.