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Java extensions

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Should I uninstall old versions of the Java extensions and if so how do I? I have 5 old versions and the only option I have is to Disable, the Uninstall button in grayed out.

Should I uninstall old versions of the Java extensions and if so how do I? I have 5 old versions and the only option I have is to Disable, the Uninstall button in grayed out.

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You don't need any of them for Java to work. You can remove the old ones, or all of them if you want. See http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions