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Thunderbird Beta for Android is now out!
(github.com)
A place to discuss the news and latest developments on the open-source browser Firefox
They have been the same team for the past 2 years. I think they have done a pretty good job developing new features thoughtfully and improving the user experience. One thing I'm really enjoying about this release is that they have made it much faster to toggle between accounts.
If they are confident adding their branding, then I take it as a show of confidence in their work.