Comment by obelix150

One great resource for those interested in contributing to Mozilla, is mikeconley's live coding sessions[0], which are cataloged here[1]. These can be used to help understand internals.

[0] https://www.youtube.com/playlist?list=PLmaFLMwlbk8wKMvfEEzp9...

[1] https://mikeconley.github.io/joy-of-coding-episode-guide/