1Password doesn't work correctly with Snap Firefox

The browser integration feature is not as simple to support as it may seem, because we have to take extra steps to protect against unauthorized access from programs running as you. Some of our past strategies for doing this completely ruled out the possibility of using sandboxed applications. I'm conducting some experiments right now that might make it possible for Flatpaks to work with this feature, and in those experiments I may discover how to make Snaps work with the feature.

The unfortunate part about sandboxed applications on Linux is that the sandbox prevents the application from reaching out. It doesn't protect the application from interference by other applications running under the same user ID, and thus we have to take extra measures to ensure that a rogue program doesn't begin masquerading as the browser extension.