Let's say you want to allow duckduckgo.com to listen to the visiblitychange event but all other sites should be blocked. Then you could use the following: ~

Let's say you want to allow duckduckgo.com to listen to the visiblitychange event but all other sites should be blocked. Then you could use the following: ~duckduckgo.com,*##+js(aeld, visibilitychange)