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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
Sad to see they only use MS GitHub instead of selfhosting something like GitLab. Just another vendor lock-in.
The cool thing about distributed version control is that it's distributed. It sounds like GitHub will just be a public remote, rather than the place where active development happens.