https://www.theregister.co.uk/2019/12/09/ad_groups_privacy_rules/

Amid the final rulemaking before the California Consumer Privacy Act (CCPA) is scheduled to take effect next year, five ad industry groups have asked California Attorney General Xavier Becerra to remove a requirement that businesses honor the privacy choices internet users make through browser settings, extensions, or other controls.

The wording of their request to Becerra appears to ask for a ban on browser and operating system-based privacy intervention, such as extensions that block ads and tracking scripts.