きちんと機能はするのですが、webサイト自体は日本語表示だけど本文が英語などの外国語といった状況では翻訳できないのがマイナスです。
webサイト自体が日本語だからなのか「リクエストされたページはすでに日本語に翻訳されています。」というエラーが表示されます。

Je l'ai déja utilisé et je l'ai trové pratique

I think I had this addon since a long time ago, I have been using Nightly for at least 2 years and there it wasn’t working. But now, I just opened the standard Firefox and found it again. I remember selecting a text, right clicking and selecting in the context menu “Translate selection with Google Translate”. It then used to change the selected text with the translated text within the same page.
It now opens a new google translate tab, and there is no setting to change this. I would like it as it was before @nobzol, is there a chance to see this happening, please?
Yeah, the T on the bar does nothing, but I’ve never ever used it, so I personally don’t care. ☺

Would be five stars but apparently the latest Firefox update has made it so that clicking on the icon does nothing. I now have to right click and choose "translate page". This is more to try and report this new bug because I can't find any other way to do it. Otherwise I love the extension.

The "T" button in the toolbar does not work. Translator is only available through the right-click context menu. Repair required.

Gostei, traduzir vai ser bem mais rápido agora.

Данное дополнение очень помогает с работой на иностранных сайтах. Но есть минус. При переводе весь текст на сайте перемещается и становится нечитабельным. Например, это перевод с арабского на английский.

This supplement helps a lot with work on foreign sites. But there is a minus. When translating all the text on the site moves and becomes unreadable. For example, this is a translation from Arabic to English.