Why Firefox isn't on Flathub?

Yeah, also saw Firefox in GNOME Software now from registry.fedoraproject.org:

Although I wonder why the installed size is so much smaller than the downloaded size…
(in Fedora 30)

However, on the package site for Firefox it currently only lists some awkward master branch for “Fedora 29 Flatpaks”:

So this confuses me a little.

So what is this about?

And https://registry.fedoraproject.org/ does not have a page of (Flatpak) apps it offers, as it seems, so searching for Firefox does not help.

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