Important: Chrome will be removing support for Chrome Apps on all platforms. Chrome browser and the Chrome Web Store will continue to support extensions. Read the announcement and learn more about migrating your app.
NPAPI Plugin support for extension has been discontinued. The documentation below is preserved for historical purposes only.
Jul 14, 2020 Java software for your computer, or the Java Runtime Environment, is also referred to as the Java Runtime, Runtime Environment, Runtime, JRE, Java Virtual Machine, Virtual Machine, Java VM, JVM, VM, Java plug-in, Java plugin, Java add-on or Java download. In Chrome, perform the following steps to enable Java (Yosemite): Click the menu icon to the right of the browser toolbar Select Settings Click the Show advanced settings. Link Click Content Settings in the 'Privacy section' Select Allow local data to be set in the 'Cookies' section Select Allow.
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NPAPI is a really big hammer that should only be used when no other approach will work.
Code running in an NPAPI plugin has the full permissions of the current user and is not sandboxed or shielded from malicious input by Google Chrome in any way. You should be especially cautious when processing input from untrusted sources, such as when working withXMLHttpRequest.
Because of the additional security risks NPAPI poses to users, extensions that use it will require manual review before being accepted in theChrome Web Store.
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How to develop an NPAPI plugin is outside the scope of this document.See Mozilla'sNPAPI plugin reference for information on how to do that.
Adblock plus for mac. Once you have an NPAPI plugin,follow these steps to get your extension using it.
- Add a section to your extension's
manifest.jsonthat describes where to find the plugin, along with other properties about it:
The 'path' property specifies the path to your plugin, relative to the manifest file. The 'public' property specifies whether your plugin can be accessed by regular web pages; the default is false, meaning only your extension can load the plugin. Add
'public': trueto make your plugin accessible on regular web pages and content scripts. But be careful - any web page will then be able to call into your plugin.
- Create an HTML file that loads your plugin by mime-type. Assuming your mime-type is 'application/x-my-extension':
This can be inside a background page or any other HTML page used by your extension. If your plugin is 'public', you can even use a content script to programmatically insert your plugin into a web page.
Including an NPAPI plugin in your extension is dangerous because pluginshave unrestricted access to the local machine. If your plugin containsa vulnerability, an attacker might be able to exploit that vulnerabilityto install malicious software on the user's machine. Instead, avoidincluding an NPAPI plugin whenever possible.
Marking your NPAPI plugin 'public' increase the attack surface of yourextension because the plugin is exposed directly to web content, makingit easier for a malicious web site to manipulate your plugin. Instead,avoid making your NPAPI plugin public whenever possible.