Absolutely doesn't work. I'd just updated Firefox, and immediately afterwards added the Pinterest extension. Even with the absolutely most up to date Firefox browser and Windows 10, the extension just doesn't work. The first page I tried to post to my Travel page on Pinterest was https://auroraborealisobservatory.com/. While on the page, I clicked the Pinterest extension and absolutely nothing happened. No error message, no Pinterest confirmation, nothing at all. I even checked Pinterest, and it hadn't received the page. (duh - no surprise there!) The developers need to go back to the drawing board on this one, maybe. Since I use Pinterest so much, even though I prefer Firefox, I'm just going back to Chrome. The Pinterest extension works perfectly there, as it has for years. :(