"The page you have attempted to translate is already in English."

No. No it is most certainly not.

이게 영어로 보이니?

I need to translate pages all day long. But this extension ALWAYS opens the translated tab in a new tab. No way to change that behavior. Ultra annoying after a few minutes.
S3.translator would translate automatically any page you visit INSIDE the current tab. And you could save which pages would always automatically be translated whenever you visited them.
Please consider changing that. Or giving us an option to do so.

inline selection translation function is now suspended, and selection translation opens the translation in a new tab.
Here a fonctionnal InLine translator: https://addons.mozilla.org/en-US/firefox/addon/imtranslator/versions/

La fonction de traduction de sélection en ligne est maintenant suspendue et la traduction de sélection ouvre la traduction dans un nouvel onglet.
Voici un traducteur InLine fonctionnel: https://addons.mozilla.org/fr/firefox/addon/imtranslator/?src=search

Stopped working recently.

Not working ! Not working ! Not working !

Google's update broke the addon, read the patch note guys. The dev has no time to look for a fix (he isn't paid to work on this btw) so deal with it.

is an invalid translator for translating pages

Не переводит выделенный текст свыше 1100 символов

Does not translate selected text over 1100 characters

Перевод текста - Не работает.