wasmer run mozilla/spidermonkey
SpiderMonkey
SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI;
You can run SpiderMonkey online:
$ spidermonkey