thunderbird.net states at the bottom: Thunderbird is now part of MZLA Technologies Corporation, a wholly owned subsidiary of Mozilla Foundation.
> There was a time when Thunderbird’s future was uncertain, and it was unclear what was going to happen to the project after it was decided Mozilla Corporation would no longer support it. But in recent years donations from Thunderbird users have allowed the project to grow and flourish organically within the Mozilla Foundation. Now, to ensure future operational success, following months of planning, we are forging a new path forward. Moving to MZLA Technologies Corporation will not only allow the Thunderbird project more flexibility and agility, but will also allow us to explore offering our users products and services that were not possible under the Mozilla Foundation
> Note that Mozilla has nothing to do with Thunderbird anymore.
which fails to claim anything about the Mozilla Foundation or Corporation in particular.
> ... MZLA Technologies Corporation, a wholly owned subsidiary of Mozilla Foundation.