Please add the functionality:
1) Make a choice of translator: Google or Yandex.
2) Translate all the old pages in the same tab, not in a new one. This is done by the plugin https://addons.mozilla.org/ru/firefox/addon/traduzir-paginas-web/

Better than the official app, but need some additional settings if I want to translate from English.

A melhor que já usei no Firefox!!

very helpful! Thanks a lot!