Some sites use 3rd party content such as fonts, videos, images or process monetary transactions using a 3rd party service such as PayPal & YouTube for video hosting.
We allow most of the required 3rd party content identified by the website for it to function properly. But there is no standard protocol and website owners mislabeled or incorrectly tag URLs knowingly or mistakenly.
The Browser Controller will block all trackers in its tracker definitions library whether it is required or not by the website. Then it is up to the member to allow or block these specific trackers or 3rd parties.