Without a doubt the best ad blocker I've ever used, and that's saying a lot. I've been an Internet user since 1994, and used Firefox since early beta, when I switched from Netscape Navigator. I'm not bragging, but merely explaining why this review can be trusted. Thank you, uBlock, Raymond Hill! As a fellow software engineer, I can honestly say your work is pure art: stable, reliable, efficient and with a small memory footprint! I love your other extensions, too.