For a couple years the graphics on this site have not loaded for me. I use Mozilla Firefox and just figured there was a compatibility problem of some sort. I got a brainstorm today and figured it out. I use a site for searching craigslist that requires I make a change to the "network.http.sendRefererHeader" in about config (changed from 2 to 1). I restored the value and now voila graphics are working. I thought I'd share in case someone else is experiencing the condition

Yup, I had the same problem. CrazedList requires you to change that, and that was the root cause of my issues.