Just found a new article in the help center: What browsers do we support?
And it contains link to Browserlist. I don't see mobile Firefox here.
Was it by mistake or this browser is not supported?
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Firefox for Mobile is not officially supported and never has been on our network. It has always been in a state of "it works but may break" in our list of supported browsers on Meta (which in fact still mentions version 10.0.3 from back in 2012).