![]() ![]() 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). 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. 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). ![]() See Java security prompts (below) for more information on Java prompts and security blocks. Java Tester - The test pages at will tell you if your web browser is enabled for Java and, if so, the Java version.Note: At time of writing, the Java test pages listed below will cause an "Application Blocked" error when Java is activated, due to security changes in Java 7 Update 51: With recent Java versions, you'll also need to confirm that you want to run Java, if prompted. In current Mozilla browsers, you'll need to activate Java. Visit one of these Java test pages to see if Java is working in your browser. 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. ![]()
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