It basically breaks xdg-open. This is crucial for a lot of flows with desktop software and I'm honestly baffled why it isn't fixed. Any URI with a custom scheme is horribly and completely broken with a browser installed as a snap. Even basic stuff like file uris are broken in browsers installed as a snap.
It's extremely weird to see this kind of thing when it happens too, you usually trust Firefox to work!
It's extremely weird to see this kind of thing when it happens too, you usually trust Firefox to work!