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Thunderbird for iOS Beta
(testflight.apple.com)
Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
This is an unofficial forum for Mozilla Thunderbird and feel free to join and discuss
Firefox is made my Mozilla Corp, Thunderbird is MZLA a subsidiary or something, independent, nonprofit. They are funded by donations and can use FF as the base (well, not on Android which is an entirely different app) and the infrastructure
2 different companies, 2 different products
Even more, Thunderbird Android is extremely new and not based on Firefox at all (based on AOSP email -> K9-Mail). Unlike Firefox Android which is Firefox.