Perfect. It does exactly what it's supposed to do in the simplest manner possible. Love it.

You can do the same by copy paste in your browser.

Facil de usar, minimalista, y totalmente practico. Lo único que agregaria es una opcion para que al traducir una pagina, abra la traduccion en la pestaña actual en lugar de abrir una nueva pestaña. Pero sin dudas la mejor extension para traducir texto en firefox.

I've selected "French" in the addon option, as the language target, but when the addon opens a new tab with the google translation site, this option is ignored.
There's a lot of translation addons using or opening a tab with google translation site, so I prefer one with working option, but if it's fixed, I could install again later.