NPAPI is the standard cross-browser plugin API and architecture. It was introduced in Netscape 2 and has been implemented by virtually every desktop web browser since then. Modern versions of Internet Explorer are the major exception. NPAPI is kind of awful but really useful.

Reference Documentation

Example Code – useful for writing one’s own plugins


Tools and Libraries

  • PluginLogger, a plugin wrapper that logs all interaction between plugins and their host browsers.
  • FireBreath, an open source library for writing NPAPI and ActiveX plugins

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