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uBlock Origin is a very popular add-on, and uses WebAssembly for multiple parts of it's codebase. The most notable being, uBlock Origin uses Wasm for hostname lookup for it's data structures that contain the list of origins it intends to block. This is a great use of WebAssembly, as it offered them better performance, compared to a JavaScript implementation, in the web browser for doing computationally intensive processing tasks over a large set of data. This can be tested in your own browser, by checking out the benchmark.
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