Works excellently, I've used it twice. It's the only favicon reloader extension I even know of that works anymore, though there might be more.

One thing that wasn't clear to me, and I had to sort of deduce, was that the orange filters that show up are only for toggling whether you see the various types of "problems" that occurred, not for filtering out request types.

I do wish that there was an option to disable retrieval of favicons from the same domain name as another bookmark that was already retrieved. That would speed up the reloading process and use way fewer resources, by like 10+X.