> I'm not sure what this webpage is, jsxfr is the name of the JavaScript library

Basically:

- The original sfxr was a win32 app, ca. 2007

- There was later a widely-used Flash port called as3sfxr, ca. 2010

- This page (TFA) is a JS port of sfxr, ca. 2011.

- `jsfxr` on npm was originally a separate JS port of as3sfxr, ca 2014

- Current `jsfxr` on npm appears to have changed hands in 2022, and is now a fork of TFA with somebody else's contributions (and a paid version, confusingly branded as "sfxr")