End users who use ad blocking software with their web browsers may not see content provided by Personalization, as some ad blockers list Personalization in their denylists. These ad blockers prevent the personalization scripts from properly loading, tracking visitor behavior, and delivering personalizations on your website.

Visitors who have ad blocking enabled and include Personalization in their denylist will see an ERR_BLOCKED_BY_CLIENT error in their browser console, as in the following example:

Ad blockers commonly block both ads and any other technology that tracks and records visitor data. Most modern ad blockers will not block external scripts from running, such as Personalization JavaScript and client-side HTTP XHR network requests.

If your visitors are experiencing these issues, recommend they remove Personalization from their ad blocker, or disable their ad blocker on Personalization-enabled websites.