[jelmervdl]

I think the Firefox extension might not work on mobile because it hooks into some undocumented addon apis to draw that translation bar UI. Those might not be available on mobile.

The translation code itself should work on mobile. It's just some javascript & wasm (albeit with SIMD instructions not implemented in Safari's WASM vm…)

[Vinnl]

I just installed the extension on Fenix Nightly and indeed, it does not work.