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As far as I know, they actually embed it: https://github.com/brave/brave-core/tree/v1.54.44/components...

Although I can't say with 100% confidence because their build system is some ... special

Brave has its own Rust implementation of an adblocker embedded in the browser: https://github.com/brave/adblock-rust; so it does not embed uBlock Origin (but the filters are mostly compatible)

Disclaimer: I work at Brave but not on the browser.

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