I have been running 1password beta on Arch linux for a few months now without incident - although I was unaware of the browser integration being made available and haven't tried it yet.
I have a newer more annoying problem as of today and that's the desktop app is instantly auto-locking itself as soon as I unlock it. Basically I open the app, type my password and hit enter, the window closes and that somehow triggers the auto-lock. Console output:
1Password Version: 8.0.30
Extension Version: N/A
OS Version: archlinux 5.11.10
Sync Type: Not Provided