[joshgev]

The default is that it forces a restart when a new update has been downloaded, which has been a frustration for me as apparently it has been for the parent.

Apparently this can be changed by requesting that FF only install updates with explicit consent[1]. I'd think the best way would be to install anything that's available locally when the browser starts without forcing a restart.

[1] https://superuser.com/questions/1451210/how-can-i-make-firef...

[Vinnl]

Are you using Linux, by any chance? IIRC, the issue here is that the update is done by your package manager, changing Firefox's files out from under them. If you use the direct download from Mozilla, it shouldn't be as disruptive.

I still hope a fix or workaround to this can be found, but knowing why something is the cause makes it easier to accept, at least for me :)