Thank you Mr. Udansky,

I did read somewhere that Mageia only uses ESR versions of Firefox, because they lack the maintainers for that package.  So they only offer Version 78.

Most of the Distrowatch chart looks accurate

Some critic on the web pointed out that Mageia probably won't release a new version again for two or more years from now, where as Fedora will have 35 by November and 36 by May, etc.

I assume Mageia 8 is more of a fixed-release than Fedora 33, meaning certain system packages in Mageia do not get updated, for example:  systemd.