For those who are saying it doesn't work: if you are using an ad blocker (like uBlock Origin or Privacy Badger) check to see if that is the issue. When I first downloaded this extension, it seemed to work on some pages but not on others. I checked my Privacy Badger settings and sure enough, PB was blocking something called assets.pinterest.com. I whitelisted it, refreshed the page, and it's working. So far so good!