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> I wish there were an API to build such a firewall, e.g. as a part of a browser extension,

There was in Manifest V2, and it still exists in Firefox.

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

That's the API Chrome removed with Manifest V3. You can still log all web requests, but you can't block them dynamically anymore.



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