Cannot compete with Google Rated 2 out of 5 stars
I started using the TinEye reverse search a long time ago. At the time, they offered a unique and useful service. The add-on was well done, the DB was growing and there was no competition.
Then, Google introduced their own reverse image search. For a while I was running add-ons for both services and checking images on both, but it became evident that TinEye cannot compete with Google's offering. About a month ago I uninstalled the TinEye add-on.
TL;DR version: Use one of the Google reverse search add-ons instead.