One of them used to; I can't remember if it was AdBlock or NoScript, but one of them had a "load ads but don't display" mode instead of the usual "deny ads completely" mode.
It was for sites that could detect whether or not the ad components were accepted for download by your machine - which I remember a few sites did early on, even before this whole war got rolling. Not many but enough did, they felt that option was necessary, and I remember having to turn it on (off?) because at least one of the sites I visited regularly required it.
I just went and looked at the ABP and NoScript options and I don't seem to be able to find that feature any more, so either they removed it or turned it on full-time. I'm guessing it was the latter, but somehow the sites can still detect whether or not you are using some kind of ad-blocking technology.