The Netscape Plug-in API (NPAPI) ushered in an early era of web innovation by offering the first standard mechanism to extend the browser. Chrome will be phasing out NPAPI support over the coming year. Starting in January 2014, Chrome will block webpage-instantiated NPAPI plug-ins by default on the Stable channel. Chrome Web Store will also be phased out support for NPAPI in May 2014, when updates will be blocked. Existing NPAPI-based Apps and Extensions will be unpublished in September 2014.”]
Source: https://blog.chromium.org/2013/09/saying-goodbye-to-our-old-friend-npapi.html