I vaguely recall installing an ad blocker a few years ago, but I don't recall what it was exactly. I know it's still working because ads are clearly missing from sites I frequent, and I am occasionally denied access to a website until I whitelist them. Obviously, since I don't know what blocker is running, I also don't know how to update the whitelist.
I know the blocker is some sort of Firefox addon (if I use IE or Chrome, ads are not blocked), but whatever it is doesn't appear under Extensions, Plugins, or Services. I've also combed through installed apps in Programs and Features, and services and processes in both msconfig and Task Manager, but I don't see anything that looks like an ad blocker.
I feel a bit sheepish asking for help with this, but does anyone know how to identify whatever it is that's blocking ads on my box?
I'm browsing with Firefox v53.0.3, and my OS is Windows 7 Professional, SP1.
Thanks in advance for your help,