As with almost every programming language, JavaScript treats various types of values differently. A string like “Hello world” is very different from a number like 42. But what types are ...

Standards proposal would allow annotations to be checked by external type checkers like TypeScript but treated as comments by the JavaScript engine.

To disable JavaScript in Firefox, you'll have to install a third-party add-on or use the configuration editor. For that, type about:config in the address field and accept the risk to continue.