Just tried testing it a simple TWO word review on this webpage, and a pop-up says (Can only translate first 1100 characters)
Um, I only had 2 words selected, and in options I had translate only selected text, otherwise whole page.
So first of all, this tells me this add-on is trying to translate whole page, even though I told it not to,
and secondly, it failed at doing the first simple test I threw at it.