Today those Chrome extensions by and large adhere to an API specification known as Manifest V2: that's what they use to, for example, inspect pages for stuff to filter out.
Google says V3 is safer - giving users more protection from wayward extensions - but some developers argue the switch from V2 to V3 cripples their extensions and makes them less effective. That would mean less effective ad blocking.
Google paused this shift from V2 to V3 back in December 2022 because its previous transition timeline proved too ambitious.
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