Mozilla has added wasm sandboxing technology to Firefox. RLBox allows us to quickly and efficiently convert existing Firefox components to run inside a WebAssembly sandbox. This isolation will ship to Linux users in Firefox 74 and to Mac users in. Firefox 75, with Windows support following soon after. The wasm component of Firefoxs JavaScript engine will eventually use the same compiler that will eventually be used in the sandboxing engine: Cranelift code. This approach also improves the startup speed of the. sandboxing.”]
Source: https://hacks.mozilla.org/2020/02/securing-firefox-with-webassembly/