SpiderMonkey: The Mozilla JavaScript runtime - Mozilla | MDNSpiderMonkey is Mozilla's JavaScript engine written in C and C++. It is used in various Mozilla products, including Firefox, and is available under the MPL2. Guides Building SpiderMonkey Build Documentation How to get SpiderMonkey source code, build it, and run the test suite. Using SpiderMonkey Introduction to the JavaScript shell Documentation of the command-line JavaScript shell, js. JSAPI User
