Ah, it definitely is that option, in both uBO and Privacy Badger. The latter doesn't actually seem to stop the demo working, though. I vaguely remember reading

Ah, it definitely is that option, in both uBO and Privacy Badger. The latter doesn't actually seem to stop the demo working, though. I vaguely remember reading something in uBO's documentation about only one extension (the first one to ask for it) getting access to some filtering feature, although I can't find the page now.