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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
So far I am not aware of a single browser with a different engine, unfortunately.
Firefox have stated that for the time it would not be viable to develop to browsers with different engines for iOS at the moment. I start to feel that by the time Apple allows for a global role out, I have moved to GrapheneOS or something (just holding on to my mini for as long as possible).
Still waiting for that, yes