The paper was only the one I remembered off the top of my head. There may be more recent work, more relative to Quantum (although the paper does look at WebExtensions), since then. I also personally like to assume that published research papers are a step behind what is happening in the wild.

But, you obviously have a good grasp on what is in your threat model and what isn't. My original comment was geared more towards the people who pile on privacy extensions, sometimes at random, who are under the impression that more extensions always equals more protection.