For example, if Java 7 Update 51 is currently installed, the Java(TM) Platform plugin in the Add-ons Manager tab should be listed as Java(TM) Platform SE 7 U51. Make sure that multiple versions of the Java(TM) Platform plugin are not being detected. If Java is installed and enabled (see above) but isn't working properly, try the following: For more information, see this help page. To resolve the problem, uninstall JavaFX. This can be caused by a conflict with Java and a standalone installation of JavaFX that prevents the Java plugin from being properly registered. In some cases, after updating from an earlier Java version to Java 7 Update 10 or above, the Java(TM) Platform plugin is no longer detected. If it's been set to false, right-click on it and select "Reset". Click I'll be careful, I promise! to continue to the about:config page. The about:config "This might void your warranty!" warning page may appear. In the Location bar, type about:config and press Enter. Mozilla browsers use plugin scanning to locate installed plugins so you should make sure that the preference has not been disabled: Make sure plugin scanning is not disabled Current Firefox releases are 32-bit browsers and you will need to install the 32-bit version of Java. On 64-bit Windows, if you only have the 64-bit version of Java installed, the Java plugin will not be available. Make sure the 32-bit version of Java is installed Make sure that Enable Java content in the browser is selected in the Java Control Panel Security tab. De-selecting this option will prevent Java applets from running in any browser and the Java plugin will no longer appear in the Firefox Add-ons Manager. Starting in Java 7, the Java Control Panel includes the Security option, "Enable Java content in the browser", which is selected by default. Make sure Java is enabled in the Java Control Panel See Re-initializing the plugins database for detailed instructions. With Firefox completely closed, delete (or rename) the pluginreg.dat file, located in the Firefox profile folder (it will be regenerated once you restart Firefox but any other plugins you may have disabled will be enabled). If the Java plugin does not appear in the Add-ons Manager, even though Java is installed, try each of the following, one at a time, and then reopen Firefox to see if that resolves the problem: Java plugin does not appear in the Add-ons Manager If Java is installed but doesn't work, try these solutions: The "Java Deployment Toolkit" plugin is used by Java developers to detect your Java version and to deploy their Java applications and does not need to be enabled for Java to work. Note: You only need to enable the "Java(TM) Platform" plugin, if it is disabled. The recommended (default) option is Ask to Activate, which lets you run Java when prompted. If Java is disabled, click on Never Activate to open its drop-down menu and select the option to activate Java. In the Add-ons Manager tab, select the Plugins panel.Ĭlick on the Java(TM) Platform plugin to select it. If Java is not working, make sure that the Java plugin is enabled in the Add-ons Manager tab:Ĭlick the menu button New Fx Menu and choose Add-ons. For more information see the Java help page What should I do when I see a security prompt from Java?. This security message is from Java, not Firefox. You may also see a Java security prompt asking you to confirm that you want to run Java. The article How to allow Java on trusted sites explains how. When you visit these pages, you will normally need to activate Java. To test whether Java is installed and enabled in Firefox, visit one of these Java test pages:
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