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Orbit by Mozilla
(orbitbymozilla.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Thunderbird is more a community project that's outside of Mozilla's jurisdiction at this point
Thunderbird is built by a for-profit subsidiary of the Mozilla Foundation, it just isn’t the Mozilla Corporation.
https://en.m.wikipedia.org/wiki/Mozilla_Thunderbird
No. It's not.
Edit: sort of is, under a subsidiary called MZLA but still seems more independent from mozilla and their shenanigans (I hope)
That changed in 2020: https://blog.thunderbird.net/2020/01/thunderbirds-new-home/