Excellent, if... Rated 4 out of 5 stars

...the image you are searching is in their database. It has been quite helpful in discovering fake profiles on LinkedIn, Twitter, etc. but I don't always get a hit. Still, if it's been crawled, TinEye will find it - sometimes several different versions, which can be helpful. I have Windows 7 Ultimate and haven't seen the problem that Mike had below.

This review is for a previous version of the add-on (1.1.1-signed).