Inline translator feedback here:
It works well from right-click context menu, but it works only once from its shortcut key.
It does although I inactivate the other extensions that I have installed.

Firefox version : Firefox 64.0.2
I'm using Windows 10 Home

+Очень не плохо.

Good translator but somehow it does not work in reading-mode which is really sad.

Nützlich und stört nicht

Good functionality but it constantly uses 1% resources in Firefox task manager. I disabled pop-up buddle, translation history, translation providers, dictionaries and for a 1 hour after browser launch it used 4 997 313 processor resources (94 340 ms) but i didn't even use it. Consumption of installed uBlock, Gmail checker plus, Tampermonkey respectively: 9800 (3.2s), 2900 (1s), 3200 (0.6s).
Updated to 15.12 and it actually not fixed for me. The same behavior