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Many web pages use [http://en.wikipedia.org/wiki/Java_applet Java applets] for interactive content such as online games. [http://en.wikipedia.org/wiki/Java_programming_language Java] is a programming language that can run on a Windows, Mac, Linux, and other computer systems. * Java is developed and maintained by [http://www.java.com/en/about Sun Microsystems]. * Java is not the same thing as JavaScript (see [[JavaScript|this article]] for information about JavaScript). Before Firefox can run Java applets you must have the '''Java Runtime Environment''' (JRE) properly installed and enabled. {for fx35} Starting in Firefox 3.6, you also need the new Java plugin included in '''Java 6 Update 15''' and above. {/for} This article will help you install or update Java and get it working in Firefox. __TOC__ = Testing Java = A number of online tools will tell you if Java is installed and enabled in Firefox. * You can visit the Java test page at [http://www.java.com/en/download/help/testvm.jsp java.com]. ** '''Note: Through the above test, you can also install the appropriate JRE for your system.''' * To verify your installed Java software, see [http://www.java.com/en/download/installed.jsp Verify Installation] at java.com. * [http://javatester.org/index.htm Java Tester] includes links to verify your Java version and whether Java is enabled. = Enabling Java = If Java is not working, make sure that the Java plugin is enabled in the Add-ons window: # Open Firefox. # {for win,linux}At the top of the Firefox window{/for}{for mac}On the menu bar{/for}, open the {menu Tools} menu, and click on {menu Add-ons}. The Add-ons window will open. # Select the {menu Plugins} panel. # Click on the '''Java''' item to select it. # Click {button Enable}. (If it says {button Disable}, Java is already enabled.) == Other software that may block Java == Even if Java is installed and enabled in Firefox, it may be blocked by other software or Firefox add-ons, such as the following: {for win} * The ZoneAlarm Pro software firewall can block Java. For more information on enabling Java through this program, see [http://forums.zonelabs.com/showthread.php?t=39390 the ZoneAlarm Pro forum].<!-- http://forums.zonelabs.com/zonelabs/board/message?board.id=AllowAccess&message.id=61 dont work anymore. looks at for the article: http://web.archive.org/web/*/http://forums.zonelabs.com/zonelabs/board/message?board.id=AllowAccess&message.id=61 --> {/for} * The NoScript extension for Firefox will block Java. For more information, see the [http://www.noscript.net/faq#qa1_8 NoScript FAQ] = Installing or updating Java = {for win} === Manual install or update === # Go to the download page at [http://java.com/download/ Java.com]. # Click the {button Free Java Download} button. # Click the {button Download Now} button to start the [http://java.com/en/download/windows_xpi.jsp online installation]. # After the installation is complete, you must restart Firefox. === Updates === * '''Automatic update:''' Java for Windows includes a [http://www.java.com/en/download/help/5000020700.xml#java_update Java Update] feature that, in Windows 2000 and later, periodically checks for updates and notifies you when an update is available for installation. * '''Manual update:''' You can also check for new updates at any time from the [http://java.sun.com/javase/6/docs/technotes/guides/deployment/deployment-guide/jcp.html Java Control Panel]. Open the Windows {menu Start Menu}, select {menu Control Panel} and double-click {menu Java} to open the Java Control Panel, and then choose the {menu Update} tab and click {button Update Now}. ;:{note}'''Note:''' To eliminate potential security vulnerabilities and to save disk space, you should remove any older Java versions that may still be installed. For more information, see [http://www.java.com/en/download/help/5000010800.xml Java.com].{/note} === Troubleshooting === After enabling Java in your operating system and through your Firefox options, Java may still fail to work properly. To activate Java, try the following suggestions: * '''Remove outdated Java plugin files from the Firefox plugins folder:''' ;:{note}'''Note:''' It is recommended that you <u>do not</u> copy Java plugins from other locations to the Firefox plugins folder. Outdated Java plugins can cause Java not to work if you update Java and then uninstall the older Java version, if plugins from the old Java version are still in the Firefox plugins folder.{/note} {for fx3} ## At the top of the Firefox window, click the {menu Tools} menu, and select {menu Add-ons}. The Add-ons window will open. ## In the Add-ons window, select the {menu Plugins} panel, to display a list of installed plugins. ##Select each Java plugin listed to make sure that all are enabled. ## Check if the Java plugins are correctly detected. All Java plugins listed in the Add-ons window should match the version number of the currently installed JRE. There should be no plugins for earlier versions of Java. For example, if JRE 6.0 Update 2 is currently installed, each Java plugin in the Add-ons window should be listed as the following: <br/> '''Java(TM) Platform SE 6 U2''' Java Plug-in 1.6.0_02 for Netscape Navigator (DLL Helper) ## If you find Java plugin files listed that do not match your current version, that means that the Firefox plugins folder contains outdated Java plugin files which should be removed. This folder is typically in the following location:<br/>{filepath C:\Program Files\Mozilla Firefox\plugins}<br/>Java files from older versions in the Firefox plugins folder can prevent Java from working. For more information, see the [http://plugindoc.mozdev.org/faqs/java.html#Issues PluginDoc Java FAQ]. {/for} *'''Add missing registry entry:''' Sometimes a Windows registry entry that Java needs may be missing. To fix, you should re-install Firefox - see the instructions in [[Installing Firefox on Windows]] for installation instructions. {/for} {for mac} Java is a core component of Mac and should be properly installed with the operating system. To update Java, use the [http://support.apple.com/kb/HT1338 Mac OS X Software Update] feature. {/for} {for linux} Visit [http://java.sun.com/javase/6/webnotes/install/jre/manual-plugin-install-linux.html Java Plugin Install for Linux] at Java.Sun.com for help installing or updating Java on your Linux system. {/for} = Issues or problems related to Java = For more information on specific issues with Java, see [[Java-related issues]]. = Additional resources = *The [http://www.java.com/en/download/faq/index_general.xml Java FAQs] page at Java.com answers some frequently asked questions. *[http://plugindoc.mozdev.org/ PluginDoc] includes Java downloads and installation instructions for other operating systems. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Java Java (mozillaZine KB)]'''''