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I did actually make a rough proof-of-concept of this! One of my long-term visions is to have it running natively in-browser, and able to automatically fix site issues caused by adblocking whenever they happen.

The PoC is a bit outdated but it's here: https://github.com/brave/cookiemonster/tree/webext

There are a couple of WebGPU LLM platforms available that form the building blocks to accomplish this right from the browser, especially since the models are so small.

https://github.com/mlc-ai/web-llm

https://huggingface.co/docs/transformers.js/en/index

You do have to worry about WebGPU compatibility in browsers though.

https://caniuse.com/webgpu

It should be possible using native messaging [1] which can call out to an external binary. The 1password extensions use that to communicate with the password manager binary.

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