The Firefox snap is published directly by Mozilla. So the best place to request that someone put effort into maintaining a nightly build is Mozilla’s contact points. Don’t expect too much, though, because it is not trivial to maintain a snap and a nightly build is likely to require their (Mozillians’) manual input regularly.
FWIW there are currently two tracks for Firefox: latest and ESR; so it is expected that if there were a nightly release added it would be in a separate track, not a separate snap.
@oSoMoN I found the problem. when update an existing firefox edge snap to a new build, it doesn’t replace (or remove) old translations properly . (so user must uninstall and reinstall it)
Also, recently i installed a separate snap (sudo snap install firefox_0 --edge) and it doesn’t have that problem.
I didn’t reproduce it multiple times. you can investigate further and fix
I see what you mean. The snap contains the latest language packs, but it seems firefox doesn’t copy them over the old ones in the profile directory. I can confirm that in my up-to-date nightly snap install, where about:support reports that the version of langpacks in the profile directory is 106.0a1buildid20220822.190304 whereas the version shipped in /snap/firefox/current/usr/lib/firefox/distribution/extensions/ is 106.0a1buildid20220907.174150.
Would you mind filing a bug to track the issue, and sharing the link to it here?