I use an addon GTranslate which has worked fine for years. Recently when I right click and select "Translate" it says service unavailable. I'm using version 0.9 which is fairly old but the latest version 1.1, I think, says only works with Firefox 38 so it must be Linux. My attempts to contact the addon creator have not been successful so far and I wondered if other forumites using Windows had any comments.
Tony