whyfirefoxisblocked.com does not know what they’re talking about. Ad Block Plus is 100% lame and 100% detectable.

The following code detects ad block plus:

index.html:
<script language="javascript"> var disabled = false; </script>
<script src="something.js?thisistotrickyou=http://a.as-us.falkag.net/...
dat/njf/41/domain.com/ros_pop_tag.js"></script>
<script language="javascript">
if(!disabled){
// DO SOMETHING HERE, like a redirect
alert("You Are Using Ad Block Plus or some other blocking software! Please don\'t, our site operates on ad revenue."); }
</script>


something.js:
disabled = true;


Proof of concept