I haven't noticed these over the years I've owned my home. Only recently I happened to look down and think "huh, that's odd, why are those outlets colored bright orange." I have, over the years, realized that color around electrical components matters.
So I Googled a bit about orange outlets but in most applications it seems to be used in hospitals. I've also found articles about it being a hospital-grade isolated ground outlet, but from a home owner's perspective, I have no idea why this is helpful. At the same time, the original homeowner clearly thought this would be a useful feature. So I'm just trying to figure out why.
(without the zoom of the above picture)
Note: Ignore the yellow stickers / red arrows. This image is from my initial home inspection which was pointing out some issues with oversized breakers. Those issues are resolved and I assume they don't affect these outlets. Sorry about the image quality, the original image was not very high res.
Inside the outlet box:
I apologize, but this is as close to disassembling the outlet as I'm comfortable with. I understand if your first impression is "those pictures are worthless", but I figured I'd post them in the event that they help in any way.