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Firefox development is moving from Mercurial to Git
(bugzilla.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Gitlab can be self-hosted. GitHub is a cloud-only service.
So they could do git.mozilla.com and it would be their own instance of git, on their own hardware (or, probably, from their own AWS account). They control it entirely.
They did host a git server at git.mozilla.org, but took it down years ago.
https://bugzilla.mozilla.org/show_bug.cgi?id=1277297
And you need a team managing it. I doubt that they have not considered it.
You can self-host GitHub. It takes around 32 GB of memory, however.
Wait really? Where?
If you can find the download for GitHub Enterprise, Ruby Concealer is little more than an XOR cipher. Make of that what you will.