I heard that Google had to rename their ad management portal's CSS styles because the site was broken for customers using ad blockers. :)

Well, still didn't work for me! :P (Privacy Badger, Disconnect, uBlock)

But I'm rather aggressively blocking anything/everything I can.

If I recall, Facebook's ad manager might've asked me to disable my Adblock in order to preview the ads. ;-)

Analytics breaks with ghostery, which is annoying.