Mozilla Introduces Firefox Nightly .deb Packages for Debian-based Linux Distros (9to5linux.com)
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For those of you who would like to use Firefox Nightly in a different language than American English, we have also created .deb packages containing the Firefox language packs.
Some context from 9to5Linux: Back in April, I reported that Mozilla was offering a DEB package of the Firefox 113 release during the beta testing phase. Unfortunately, that was the only time a DEB package was available for download and, of course, it didn't make it into the final release of Firefox 113, nor future releases. It would appear that Mozilla needed more time to work on the DEB package for Debian and Ubuntu-based distributions, and it looks like it will finally become a thing starting with an upcoming Firefox release, like Firefox 121 or later...
Using the DEB package over Snap or the official binary package offers some benefits like better performance due to advanced compiler-based optimizations, hardened binaries with all security flags enabled, access to the latest Firefox releases as fast as possible [because the .deb is integrated into Firefox's release process], and you won't have to create your own .desktop file anymore.