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It's complicated? They have advantages and disadvantages over extensions. For most people who just installed an adblocker and never touched its settings, I bet they're practically equivalent.

Advantages: privacy, efficiency

Disadvantages: lack of flexibility, some things they just can't do

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If you have some source about the efficiency advantage, could you please share?

I only ever read that hypothetically it could be more efficient but never stumbled upon actual measurements/benchmarks.

Also, extension adblockers are already so efficient that I would doubt there is a perceptible difference.

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