By the way, if one were already using uMatrix and NoScript, what benefit would Policeman provide?

Might I also add, Random Agent Spoofer, Decentraleyes, and Web of Trust

FWIW, uMatrix includes randomized user agent spoofing.

It doesn't appear to work properly. I read a thread on Gorhill's Github page and the whole thing seemed really convoluted. I activated the function but when I tested it my UA wasn't spoofed. Also, the list from which to choose/randomly assign is pretty short, though I think Gorhill made it so by design.