Before the release of FF57, this add-on deserved 5 stars.
But now, I cannot give more than a single star, because I'm on FF59.0.2
and there's no translator-icon next to the marked text at all, never.
My system is a Linux Mint 18.1 MATE 64 bit (and 32 bit on another machine).
Please fix this, especially for Linux users, too.

A pop-up button does not always appear.

Werkt NIET waardeloze addon

I am giving one star because popup windows sometimes do not appear

Not working now :(

Works unexpectedly... Sometimes the bubble appears, sometimes it doesn't

Can not work on Firefox 58.0.2.

stopped working - no more bubble - no more context menu

No function after restart of Firefox.
Necessary to edit settings each time to make the add-on work for one session. :(

FIX THE BUG PLEASE

не работает !

Non funziona bene. Il pop up appare in maniera irregolare. Non affidabile

This used to be great, but it still doesn't work consistently with FF Quantum. Try Simple Translate 1.7.1 (https://addons.mozilla.org/en-US/firefox/addon/simple-translate/?src=api) for a pop-up translation button that works.

It's still the same bug like earlier Versions. Can't understand why some User give five Stars.

Nothing is fixed in 0.5.6! This is getting sad.

I'm down-rating this more for the lack of communication from the developer, even on GitHub.

pop up not working correctly :(

add-on not work any more it's so buggy sometime works sometime not

After update to 0.5.5 double clicking a word for translating still not working :-( Please fix...

Don't work

Pop-up window doesn't appear (both with double click and icon options). The cursor changes at the position, where it should be, but the window can not be seen.

Isn't working on Firefox 57(stable). NET Error: Cannot Access Google Translate!