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(Android Authority) Don’t expect Firefox for Android to get tablet UI anytime soon
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A place to discuss the news and latest developments on the open-source browser Firefox
Its the Linux version. You need to setup Termux with a Linux desktop for it to work. As I recall the ESR version was the only one that worked properly. This was 4 years ago now so it may not work.
Just a side note, if you do install Termux make sure you install it from F-droid. The Termux from the play store is missing functionality and tends to ddos the repos. It also isn't really maintained.