No issues at all so far, it's much better than the Chrome's Always Translate feature, which fails to translate certain texts including Twitter posts, this add-on TWP translates everything so far including Twitter posts that Chrome fails to do. I highly recommend this extension so far, I hope it doesn't disappoint in the long run and will definitely be donating if it stays this good.

Cons:
- Doesn't translate Google maps.
- Doesn't translate images (don't think this is possible for an extension though).
- Doesn't translate automatically sometimes (refreshing or pressing the button fixes this).
- Doesn't translate background tabs.

Edit: Noticed that subtitles/captions for sites (YouTube for example) become mixed, some parts of the text is not translated while some are, preferably it should all be translated, or not translated at all.

smooth translator! great experience. close to the google chrome translate entire page or partial text experience!

I've been using this extension for a long time, but since the last update, it often doesn't translate pages into French when I ask it to.
I have to shut down the plugin in Firefox then restart it to get it to work almost every time.

Fast, Cool. Спасибо

This works wonderfully. Truly a "just works" piece of software.

No experience, down for maintenance they say