Para o Mozila Firefox penso que é a melhor até agora.

Quando seleciona o texto aparecem três ícones: Um para traduzir, outro para reproduzir o áudio e um para copiar o mesmo. Show de bola.

Quando clica na extensão na barra de ferramentas tem atalho para o Google Tradutor.

Tudo que eu uso. Muito Bom 100% 5 stars

Traduction très rapide et facile même en mode Lecture.
Cependant c'est dommage que cela s'affiche dans une notification windows.

je mon sert souvent je suis ravie de se module

Перестал переводить, "Ошибка соединения с сервером https://translate.google.com
Повторите запрос еще раз."
Притом слово yandex всегда переводит)) хоть по удержанию хоть при выделении.

@developer Mate where are you? What happens? This is the BEST translate addon.
PS
Since Google constantly change his code to break non-google services and to FORCE users to use they're products, why don't consider Yandex as main translate engine, or something else that have nothing to do with G?

It hasn't the ui in the world but still it was useful. HOWEVER, you NEVER advertize for autotranslating youtube, and NEVER asked for my permission, you made me waste so much time to get rid of it because I didn't know it came from you, it shouldn't EVER have been activated by default without explicitely telling your user about it.