It is easy to reach the 330,000 rules limit with just one extension. Users may add their own custom rules to many content blockers or subscribe to more rules listings. The default configuration of uBlock Origin uses 80435 network filters and 45243 cosmetic filters that is already more than four times the minimum guaranteed rules limit. The number may sound like much, but when you realize that modern content blockers rely on tens of thousands of even hundred thousands of rules, the limitation becomes apparent right away. Any one extension has guaranteed access to 30,000 rules. One of the main issues of Manifest V3 is that it imposes a fixed limit of 330,000 rules for all extensions installed in Chrome. While they managed to produce a working content blocker based on Manifest V3, they concede that it has certain limitations that Manifest V2 content blockers did not have. The developers note that the new APIs of Manifest V3 caused a lot of headache during development. Work on the extension started in mid-2021.

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