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Remove embedded adverts in webpages
You want to show webpages without embedded adverts.

Blank block page
There are webpages having embedded adverts from other domains. One of the problems for blocking these adverts with NxFilter would be having a mangled webpage as a result of blocking. Your block page replaces the embedded adverts.

To avoid of having this kind of problem, there are two ways of removing embedded adverts with NxFilter. One is to block it using 'Ad-remove'  option on a policy. With this option enabled, NxFilter blocks a domain in 'Ads'  category with a blank block page. The other method is using a special category on 'Category > Custom'  that is 'ad-remove'. If you add a domain into the category and block the category somewhere, NxFilter blocks the domain with a blank block page.