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Information on security and stability issues affecting Java is available at Oracle's Critical Patch Updates and Security Alerts page.
Java is a programming language originally developed by Sun Microsystems (now Oracle).
De-selecting this option will prevent Java applets from running in any browser and the Java plugin will no longer appear in the Firefox or Sea Monkey Add-ons Manager or about:plugins list.
To view or change this option, click the Java icon in the Windows Control Panel or Mac OS X System Preferences to open the Java Control Panel, then select the Security tab.    Mac OS: You can download Java from Apple Support Downloads (Java 6 and below). Windows and Linux: You can download Java here or you can select the offline (full) installer for your operating system from this download page.
On Windows, make sure you select the 32-bit JRE since Firefox and Sea Monkey official releases are 32-bit (e.g., select "Windows x86 Offline" for the offline installer linked from Oracle's Java SE Downloads page).
See below for more information on installing or updating Java on Windows.
Depending on the version of Java and your Mozilla browser, the Java plugin may be disabled in the Firefox or Sea Monkey Add-ons Manager or the Java plugin may require Click to Play (CTP) activation. 
You can then go to the "Update" tab and click the "Update Now" button, to see if an update is available.
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See 64 bit builds for more information about 64-bit versions of Mozilla applications.
   Note: The Java Embedding Plugin has been bundled with Mac distributions of older Mozilla browsers, including Firefox 3.x and Sea Monkey 2.0.