[lioeters]

In addition to the use cases other comments have listed, Firefox uses WASM internally as a sandbox environment.

WebAssembly and Back Again: Fine-Grained Sandboxing in Firefox - https://hacks.mozilla.org/2021/12/webassembly-and-back-again...

Neural Machine Translation Engine for Firefox Translations - https://hacks.mozilla.org/2022/06/neural-machine-translation...