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Google already classifies sites as porn or not-porn. They could make a simple API or data file available and the browsers could use it.

You want to tell google each time you visit a porn site?

(not that they don't know already since the site probably uses google analytics)

I think Bloom filters would allow offline checking, without pinging Google for each request. They already do this for antimalware notices, iirc.

Google developed porn filters during a crisis in 2001. It's a very valuable technology that they're not going to let just anybody share