onBeforeRequest(), though, is just one of several ways to run arbitrary JS on a 3rd party page within an extension. There's a reason it's "first to be hobbled"

onBeforeRequest(), though, is just one of several ways to run arbitrary JS on a 3rd party page within an extension. There's a reason it's "first to be hobbled", and that reason isn't privacy. Nobody can prove intent, of course, but I'm predicting the pace of "privacy improvements" slows considerably after the smart heuristic-based ad blockers are out of the way.