How can I find out about development of Thunderbird?

Question

I can't find any information on development of Thunderbird.
Links on the Thunderbird homepage only take me to the general "Mozilla" pages instead of any Thunderbird-specific pages. https://www.mozilla.org/en-US/thunderbird/

Answer 1

Thunderbird is a community project and while Mozilla's involvement is significantly reduced, that does not get the code base out on it's own. Thunderbird and SeaMonkey are basically the comm central folder in the Mozilla code base. Hence everything linking to Mozilla. Thunderbird shared the Geko layout engine with Firefox and to all intents and purposes that is almost indistinguishable from Firefox. The result is Thunderbird developers find themselves working on core to fix Thunderbird bugs, even though it is technically part of Firefox.
Everything is controlled through bugzilla. enhancements, faults, poor usability and design. You do not need to do more that assign your self a bug and start coding. Although the involvement of the module owner or a peer helps get patches accepted. https://wiki.mozilla.org/Modules/Thunderbird
Bugzilla is used to extract details of bugs fixed (including enhancement) for the documentation of release notes. Because flagging bug for inclusion in release notes is manual there are always those the just appear without a release notes.
Talking or communicating with other developers appears to still be mostly IRC. (Global means Global at Mozilla with people in many countries collaborating)
This wiki page https://wiki.mozilla.org/IRC after lots of instructions does tell you what channels are for what in Mozilla IRC.
Links to mercurial, are on this page. https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code/Mercurial
Downloadable source here https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code/Downloading_Source_Archives
Is there a specific area you were looking at? perhaps I can point you to someone.