the article is quite old and probably refers to a lot of things which no longer exist in ff for android. this is even more likely true of the extension, which probably was never ported to the new ff architecture. for one, i am unsure where you set host to localhost, but that does not appear in any instructions except in the extension, where it knows already what it is looking for. it seems that if you cat your onion service, it should give you your host name, which may be where that setting should point? also, ensure tor is actually using that port, which was deprecated. i am not entirely sure what you wish to accomplish, but it seems somewhere between getting things to run through termux as an interest, and straight up using tor for privacy. if the latter is most important, i would suggest one of the tor browser apps. otherwise, someone with a better specific knowledge of how all three bits of code interact in android will hopefully appear. you may wish to check with the termux community as well. best wishes.