I just found out that Pass has offline mode from a recent email they sent and found language saying the same in the browser extension (see below). Proton is blocked on my work’s network for some reason so as far as Proton is concerned I’m “offline”, but I still can’t access the credentials stored in the browser extension when I’m at work.

Can someone help explain?

• Quick offline access to your login data: Access your stored passwords and notes in Pass from wherever you are, even when you don’t have internet connection. https://addons.mozilla.org/en-US/firefox/addon/proton-pass/

And this is from their recent email