Oh don't let me get me started on this. I use Firefox on a work machine and I spent a number of hours troubleshooting why it couldn't access the Internet when I was connected on VPN.
I suspected it had something to do with snapd, so I downloaded the .tar.gz release of Firefox and it worked. I kept investigating and figured it must have something to do with snap.firefox.firefox apparmor profile because the VPN client was symlinking the /etc/resolv.conf to /opt/.../resolv.conf
However, updating the apparmor profile didn't help so I ultimately realized that snap has a hardcoded list of paths that get mounted into the app container [1] and there's no way to change this.
There are a number of reasons to hate on snapd, but this almost made me flip the table.
Also, as a bonus point, if you look at the apparmor profile I mentioned it has a ton of comments about chrome, so someone must've just copy pasted it and modified to work with Firefox. GrEaT SeCuRiTy!
[1]: https://github.com/snapcore/snapd/blob/3a88dc38ca122eba97192...
