Some developers and trackers do not like users that have installed ABP or another form of adblocking and have come up with specific scripts that block ad blocking users and redirect them to another page. One such is:
Is NS protecting users of ABP and ad-blovking against the blocking blocker?
Test there gives me a page with this message
This is the page that normal users are going to see.
Users using Ad blocking software are redirected to the url specified in check.js
If you first had your ad blocking software turned off while visiting this page, you have to wait 60 seconds before visiting this page again to get redirected. (Because the cookie set for a non ad blocking user is set to last for 60 seconds)