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> Cosmetic meaning what exactly?

Filter lists are composed of two types of rules: “cosmetic” and “network”. Network rules define what needs to be done with web requests (block or redirect). In MV3 these rules should now be implemented via new declarative API.

Cosmetic rules is a very wide subset of ad blocking rules that define how a web page needs to be changed. These are implemented the old way.

> I don't see any issues with ublock in firefox, so what's going on there?

uBlock Origin does not use remote JS so yeah, what’s going on with the article is a good question.



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