How block "Visual match" pop-ups?
Recently, whenever I'm shopping in Safari on a page that includes a picture of something, I'll get a pop-up titled "Visual Match" that has a series of thumbnails of similar items, with an "Explore" area to their left and a "More" area to their right.
How can one completely block Visual Match? Preferably without blocking other pop-ups!
This began happening at least with the lastest Safari under OS X 10.8.5, and the same thing persists now wtih Safari 7.0 under OS X 10.9.
iMac, OS X Mountain Lion, 3.4GHz Corei7, 16GB, SSD + 2T HD