Very good Extension with many custom options to Adjust. Which this will might be too much overwhelming for many users. You must take a little time to play and experiment with the settings, to see which one fits you most and make your workflow convenient.
* The only thing I don't get is From where does it takes those translations? I mean it is completely different from other similar Addons who use the google translate original webpage to perform the translations... BUT the Translations from English into Greek are Excellent!! Can someone tell me what translation software does this addon is using?

Super

Best Translate App ever . but very soon : Service usage limit reached . How and where can i buy full version for home pc

長文を選択しても安定して翻訳機能が使えるので非常に便利です。

I have been looking for a replacement for the legacy Translator for Firefox extension for a long time. Finally, there is something that can be used. Thank you very much.

ABSOLUTELY FANTASTIC ! I rarely review an extension, but i must log in and rate this !
Just highlight the text then a translate box open ! Simple, but fast and elegant.
In option, MUST CHECK "Directly display the translation panel without displaying the button." first.