I installed Chrome and added the Malwarebytes extension, then browsed forums.azbilliards.com to try to replicate the issue, and nothing lit up.
JS Miner:
Quick google search indicates this is a name for a family of Java Script for Coinhive, a cryptocurrency miner (think bitcoin). Java Script runs inside your web browser, usually to provide video, audio or in this case to mine cryptocurrency.
My educated guess is the script isn't coming from AZ, but one of the ad sites is infected, which is likely hosted on IP 38.134.106.64. So, this could explain why some of us are seeing it, and not everyone. One possible tell is if loading pages takes longer than usual. If one of the advertisers pages are compromised, AZ staff can simply block it, if they haven't already done so.
:IP 38.134.106.64
rwhois V-1.5:0010b0:00 rwhois.cogentco.com (CGNT rwhoisd 0.0.0)
network:ID:NET4-26866A401A
network:Network-Name:NET4-26866A401A
network:IP-Network:38.134.106.64/26
network:Org-Name: Danidin LLC
network:Street-Address:9651 Hornbaker Road
network:City:Manassas
network
ostal-Code:20109
network:Tech-Contact:ZC108-ARIN
network:Updated:2016-08-09 14:32:18
%ok
This is a web hosting service, likely hosting on of the AZ sponsor banners, which could be infected with JS Miner.