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.