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Why do I need Java 6 Update 10 and above for Firefox 3.6 and later versions?

This article applies to:
  • Browser(s): Firefox
  • Java version(s): 6.0, 6u10+

Starting with Firefox 3.6, Java-based applications will NOT work unless you are running Java version 6 Update 10 or newer.

If you are not sure what version of Java you are running, check your version. If you find that you are running a version of Java older than version 6 Update 10, you will need to update to latest Java version to keep running Java applications in Firefox:

  • Update your Java before updating to Firefox 3.6 and later versions. By updating your Java to the latest version, you will also enable support for the new Java plug-in. This plug-in not only runs Java applications faster in your web browser, but it also adds some cool new features, such as the ability to click and drag certain Java applications from inside your web browser to your desktop.


Starting in Firefox 3.6, Mozilla foundation will drop support on OJI (Open Java Virtual Machine Integration) and will only support the standard NPAPI and NPRuntime interfaces. The Java Plug-in which is in Java version 6 update 10 or newer versions supports the NPAPI and NPRuntime interfaces. Therefore, starting with Firefox 3.6, Java-based applets will NOT work unless you are running Java version 6 Update 10 or newer.

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