Does anybody here know how that's implemented, and what the difference is to this (if any)? I lost track of all the methods (current and past) to block ads via

Does anybody here know how that's implemented, and what the difference is to this (if any)? I lost track of all the methods (current and past) to block ads via browser extensions. Which of the two, if any, use "declarative blocking"; which inject JavaScript (and by extension require trust and site access permissions)?