Two years ago, Google has announced their plans to depreciate The Netscape Plug-in API (NPAAPI) in the Chrome browser. They’ve provided an update on it today:" last September we announced our plan to remove NPAPI support from Chrome, a change that will improve Chrome’s security, speed, and stability as well as reduce complexity in the code base. Since our last update, NPAPI usage has continued its decline. Given this usage data, we will continue with our deprecation plan."
Chrome NPAPI Plugins deprecation timeline
Currently NPAPI Plugins except the whitelisted ones are blocked by default.
In January 2015, Chrome will remove the support for the whitelisted plugins, means, all plugins will be blocked by default.
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In April 2015, NPAPI support will be disabled in the browser, however, for advanced users and enterprise an override will be provided via chrome://flags/#enable-npapi and Enterprise Policy, so that they can "temporarily re-enable NPAPI while they wait for mission-critical plugins to make the transition."
In September 2015, the override will be removed and NPAPI support also will be permanently removed from Chrome. Installed extensions that require NPAPI plugins can not load those plugins then.
Check NPAPI depreciation guide page for more details.