Netscape Plugin Application Programming Interface (NPAPI) is a cross-platform plugin architecture used by many web browsers. It was first developed for Netscape browsers, starting in 1995 with Netscape Navigator 2.0, but was subsequently adopted and implemented by many other browsers, although some browsers later dropped support. A plugin declares that it handles certain content types (e.g. "audio/mp3"). When the browser encounters that content type it loads the associated plugin, sets aside space within the browser context for the plugin to render and then streams data to it. The plugin is then...