great with firefox. The "off" button is big and fat for those situations where you need to unblock. It doesn't seem to impact sites too much, the occasional redirect, which is good to be informed about.
I never thought I'd need another ad blocker after Adblock. But they sold out. And then there were companies pretending to be uBlock which also didn't do the job properly. I don't understand why everyone doesn't use it. So if a friend is using nothing, then I will install it for them. If they're using AdBlock, I uninstall it, and install this. One of the best utilities out there.