Have you considered using NoScript? It might be easier to whitelist the few widgets you care about, vs. tracking down miscreants.
The web is not safe to use without NoScript.
I just installed RequestPolicy addon after going through this thread, and am hoping it will be a good tradeoff (other reason for installing this instead of NoScript are those annoying ad-filled pages NoScript shows after its frequent updates, and its author's attempts to fiddle with ABP sometime back, making his integrity questionable).
I reinstalled NoScript a while back. IMO, the problems it prevents outweigh the problems it causes.