I wonder if mozilla will migrate development to github.com now that phabricator development has been stopped.

(Former Mozilla employee)

I would be very surprised if they did. The Firefox development workflow does not map very well onto Github.

care to explain concretely how it does not map?

For one, phabricator is only used for code reviews, not for issue tracking which is managed by bugzilla. Github issues are nowhere near usable for a large product such as gecko/firefox.

> Github issues are nowhere near usable for a large product such as gecko/firefox

I have huge doubts about that. Looking at the development of Servo on github was beautiful, the colored tags, the PR views, the activity stats, the reviews diffs, the wikis, everything about it was much more readable than it is on Bugzilla/phabricator IMHO. https://github.com/servo/servo The same can be said currently about webrender.

About scale, github is battletested, for Example Rust is an example of a large scale repo with a LOT of activity (~has more weekly commits than gecko-dev) so the premise Github issues are nowhere near usable for a large product seems false. What idiosyncrasies could mozilla devs have that are immutable and that make them so much different from large projects developped on github? You specifically mention issues: Github can do meta-issues, can auto closes issues after PR merge, has bidirectional PR/issues references, can autoclose issues on markdown checklist check, etc etc and if you couldn't fit into existing github features, I'm pretty sure you could totally solve your issues with Actions such as https://github.com/marketplace/actions/dependent-issues Also github is accomodating, when the Apache foundation migrated to github they were open to do changes to the platform to facilitate Apache needs, cf: https://github.blog/2019-04-29-apache-joins-github-community...

In addition to my belief that github can be better or at least as good as buzilla, if gecko migrated to github, it would attract order of magnitudes more open source contributions because of the lower barrier to entry and to familiarity (also bugzilla is awful on smartphones) You really think you should seriously consider the migration.