>android
Not even sure if that would be possible, given FF desktop and mobile are two separate codebases. Not to mention IIRC they rewrote the mobile one a couple of times for the hell of it.
(K4sum1 should do it just to get himself on all the descargar apk gratis para android websites tbh. lol)
>legacy apple
iOS app development is bullshit, so that's completely out of the question, and if you really want to use it on MacOS, you could try compiling from source. However the modded dependencies K4sum1 used might cause problems on non-Windows OS, so ask him about it before trying to do anything.
Unless you're asking about PPC, in which... I have no idea.