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Firefox Git Migration Update
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Firefox Git Migration Update

Apr 2025

Overview

We are migrating Firefox development from Mercurial to Git.

The work has two main phases:

(1) Change the source of truth for Firefox from Mercurial to Git

(2) Decommission Mercurial

When?  When?

We are currently expecting to make the change for phase one on the 30th April 2025.

No decisions have been made around the timing of the second phase, and therefore the timing of decommissioning of the Mercurial infrastructure.  We expect hg.mozilla.org to be available in some capacity for at least another year.

What Will Be Different, What Will Stay The Same?

What's Going To Happen To All The Repos?

Mercurial Repository

Git Branch

mozilla-central

main

mozilla-beta

beta

mozilla-release

release

mozilla-esr*

esr-*

autoland

autoland