Plug-n-Hack (PnH) is a proposed standard from the Mozilla security team for defining how security tools can interact with browsers in a more useful and usable way. The current protocol and Firefox implementation are released under the Mozilla Public License 2.0 which means it can be incorporated in commercial tools without charge. The next phase of PnH is still being planned but is intended to allow browsers to advertise their capabilities to security tools to use them directly from the browser. The project is an open project and we welcome involvement from anyone, especially people working on other security tools and other browsers.”]
Source: https://blog.mozilla.org/security/2013/08/22/plug-n-hack/