Gregory's Server@ariadne @rysiek @dethos first, as mentioned in the article, the ad blocker uBlock is a trusted addon, and thus not blocked by the new feature. It appears that it will only affect add-ons that aren't checked by Mozilla. Second, it's up to Mozilla which websites are protected, not up to the website owners themselves.
@durchaus @ariadne @rysiek regardless of the current config, what matters is the capability that the vendor is giving himself and the way it was communicated.
The list can easily change overtime to accommodate Mozilla's needs (or their "customers" needs).