[amarshall]

> it has had this annoying habit of requiring me to restart my browser whenever it updates in the background

This happens because Firefox detects that its files have changed underneath it while its running—this can cause problems due to, I guess, the multi-process architecture and sandboxing not liking mismatches between what is running and what it might start. The built-in updater performs updates in a way that doesn’t cause this. Package managers that do not update Firefox in-place (e.g. Nix) do not have this problem either.

As noted in a sibling comment, this new package does not seem to have the issue either. I wonder what they changed.