Yup. Even if you add the official mozilla repos, Cannoical adds a prefix to their version so it always takes precedence over the official release. You have to pin the mozilla repo to blacklist the snapped version.

Same goes for Thunderbird.

I’m sure Snap has some security advantages for many users but they’ve made it so user-hostile for those who use native browser extensions or who want to automate deployments with just one packaging system.

Anyway, rant over - fuck Snap.