Why use this at all? Just keep open a tab on Google Translate instead. Or better yet, find an extension that actually does inline translations. There's a few on Firefox Addons.

خوب هست

it doesnt translate the language after you change the main one spanish

me ayuda a buscar lo que nesecito

I think this as a useful tool

genial una app genial

Pas possible de choisir le français par défaut à la place de l'espagnol.