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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's AGPL so I don't think there's anything stopping you from moving to a self managed instance.
No Gitlab is not AGPL, it is partly MIT and the corporate branch is under a proprietary license
Still better than a fully closed, 100% proprietary, cloud-only Microsoft service.