I (probably unfairly) rated this at 1/5 stars... I am upset that their extension information page did not SAY ANYTHING about it using their website to accomplish this task. It may work well, I don't know. BUT privacy is a prime concern for me, and they didn't even consider I would take that into account in making my choice to use their extension.

EDIT: They've responded to the above review (see below). Unless I'm reading their response incorrectly, they seem not to have even understood that my problem was with their withholding of the information that they were sending my webpage to their own site for processing, rather than with the function of the extension itself. It seems like a cognitive disconnect on their part. Or they just didn't actually read it. Still 1/5 stars.