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Any plugins you may have disabled in the Firefox or SeaMonkey Add-ons Manager will be re-enabled. A new pluginreg.dat file will be generated when you restart the browser.

Open the Firefox profile folder or the SeaMonkey profile folder, then completely close Firefox or SeaMonkey and delete (or rename) the 'pluginreg.dat' file.

If the Java plugin does not appear in the Add-ons Manager, even though Java is installed, first do the following before reinstalling Java or trying other solutions: If the Java plugin does not appear in the Add-ons Manager even though Java is installed If you only see the Java Deployment Toolkit plugin listed in the Add-ons Manager, then Java is not properly detected. The Java Deployment Toolkit plugin, which is installed along with Java, does NOT need to be enabled for Java applets to work. Note: Starting in Firefox 23 and SeaMonkey 2.20, the button to 'Disable' or 'Enable' plugins has been replaced with a drop-down menu with the click-to-play options 'Always Activate' to enable, 'Ask to Activate' to set click-to-play, and 'Never Activate' to disable ( bug 549697).

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On Windows with the Java 7 Update 25 plugin enabled, the plugin entry would look like this in Firefox 22 (If the Java plugin is disabled, the entry will be 'greyed out' with an 'Enable' button.) The Java plugin must be detected and enabled in the Firefox or SeaMonkey Add-ons Manager for Java applets to work in the browser. On Windows, the Java plugin will be listed as Java(TM) Platform SE and underneath, it will show 'Next Generation Java Plug-in for Mozilla browsers', where refers to the Java plugin version.

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On Mac OS, the Java plugin is shown as Java Applet Plug-in (on Mac OS X 10.6 or below, it may also be listed as Java Plug-in 2 for NPAPI Browsers). The Java plugin name shown will depend on your operating system and Java version.

Firefox: '(Firefox button or Tools menu) -> Add-ons -> Plugins -> Java plugin.

SeaMonkey: 'Tools -> Add-ons Manager -> Plugins -> Java plugin.

If Java is installed but isn't working, make sure that the Java plugin is enabled in the Add-ons Manager Plugins list (see Managing installed plugins for more information).

6.7.3 Mozilla PluginCheck webpage identifies the latest Java 7 plugin as vulnerable.

6.7.2 Plugin Check reports outdated Java has been disabled when it is up-to-date or when Java is not installed.

6.5 Java applet causes backwards or jumbled typing in text boxes.

6.4 Java applet causes browser process to remain in memory after exiting the browser.

6.1 Java content requires click-to-play activation.

5.3.3.4 Remove outdated Java files from the browser plugins folder.

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5.3.3.1 Use Internet Explorer to install Java.

3 If Java is installed and enabled but does not work.

2.3 Enabling and disabling Java from the Java Control Panel.

2.1 If the Java plugin does not appear in the Add-ons Manager even though Java is installed.

Depending on the version of Java and your Mozilla browser, the Java plugin may be disabled in the Firefox or SeaMonkey Add-ons Manager or the Java plugin may require Click to Play (CTP) activation. Important: Mozilla adds outdated or insecure plugins to its Add-ons Blocklist as a security measure. Starting in Firefox 3.6, Java will not work unless you are using the Next-Generation Java Plug-In (included in Java 6 Update 10 and above). See JavaScript is not Java for more information. Note that Java is not the same as JavaScript. To run these Java applets, you need the 'Java Runtime Environment' ('JRE') installed and enabled. Many web pages use Java applets for interactive content such as online games.

Java is a programming language originally developed by Sun Microsystems (now Oracle).

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Information on security and stability issues affecting Java is available at Oracle's Critical Patch Updates and Security Alerts page. Plug-ins can cause crashes and hangs and may contain security vulnerabilities. Mozilla applications are regularly updated for security and stability however, Mozilla does not provide updates for plug-ins.

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