Continuing with our effort to eradicate vulnerable versions of the Java plugin, we are now blocking it for all versions of Mac OS X. We had previously blocked it for old Mac OS X versions because they would not be updated anyway, and we were holding off on updating modern versions because of a bug in the Add-ons Manager that is now fixed in Firefox 12.

On Lion (Mac OSX 10.7), this plugin will be called 'Java Applet Plug-in. Click on the 'Enable' button for this plugin to enable it OR click on the 'Disable' button to turn off Java for Firefox Java on Leopard and earlier versions of Mac OSX. Aug 03, 2020 Enable java plugin in your web browser; After installing or upgrading Java, completely quit, then relaunch the web browser. Clear the browser cache. On Macintosh Google Chrome is incompatible with most Java web applications and web pages that use a Java applet, due to the fact that the Java plugin is 64-bit and Google Chrome is 32-bit. I want to add java plugin for FireFox (v10.0.12) on Linux(Centos 5.6 64bit). I have JDK 1.7.012 installed, and add a symbolic link to plugin folder under /usr/lib/mozilla to the file libnpjp2.so.

All users of Mac OS X 10.6 and above should have already been prompted to install this update. In order to avoid the block, please update immediately using Software Update. If for some reason you need to continue using an old version of the plugin, you can re-enable it in the Add-ons Manager.

Last updated: January 25, 2019

Update: Firefox support for the Java NPAPI plugin ended with Firefox 52. If you run Windows 10 and need to view Java content, please see the Java support on Windows 10 article instead for more information. macOS users, please see Java support in Safari 12.

Firefox is a free web browser application developed by the Mozilla Foundation. It runs on desktops with the Windows, Mac OS X and Linux operating systems. A mobile version of Firefox is available for Android devices. A mobile version of Firefox will also be available soon for iOS devices.

Java is a free software developed by Oracle Corporation, and also a programming language. When you download and install the free Java software, you are installing the Java Runtime Environment (JRE), including the Java Virtual Machine (JVM). When referring to “Java” in this article, we are referring to JRE, a web browser plug-in required to load Java content in Firefox.

The following information pertains only to the 32-bit version of Firefox. Firefox 64-bit does not support Java. The very first step in resolving Java-related issues with your computer is to make sure your Java installation is current.

Enable Java in Firefox

If Java content does not load in a Firefox browser window, it may be that Java is disabled in Firefox’s Add-ons Manager. To check, click Tools in the Menu Bar at the top of a Firefox window, and click Add-ons from the drop-down menu (alternatively, type the keyboard command CTRL+SHIFT+A, or type about:addons in the browser’s address bar).

If your Menu Bar is not visible, click the Menu Button and choose Add-ons.

The Add-ons Manager will open in a new tab or window. In the left navigation, click Plugins. An alphabetical list of all currently installed plugins will display. Scroll down the list to find Java(TM) Platform SE in the list.

If you see (disabled) display for Java, it means that Java content will not display in Firefox. To display Java content, you must enable Java. To do so, click the Never Activate pull-down menu.

Select Ask to Activate if you want Firefox to ask you to activate Java each time you encounter Java content. Select Always Activate if you always want Java to activate without being asked. Your selection saves automatically, and (disabled) no longer displays.

Reload the Firefox window that contains Java content, and the Java content can now display.

Disable Java in Firefox

To disable Java in Firefox, open the Firefox Add-ons Manager following the instructions above. In the left navigation, click Plugins. An alphabetical list of all currently installed plugins will display. Next, scroll down the list to find Java(TM) Platform SE in the list. Click the Ask to Activate (or Always Activate) pull-down menu. Select Never Activate if you never want to use the Java add-on with Firefox. Your selection saves automatically.

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To download the latest version of Firefox for free, visit the Firefox web site. Thank you for visiting Tech Help Knowledgebase to learn how to enable and disable Java in Firefox.

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