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My son upgraded a download for Firefox and now I can not get or install Java

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My son saw a window pop up that said install firefox and a # do not know if it was a 6 or ??. He downloaded because he likes Firefox as do I. But this is not compatible with other programs like Java I can not install or get older version on laptop. An suggestions? I am not a computer expert!

My son saw a window pop up that said install firefox and a # do not know if it was a 6 or ??. He downloaded because he likes Firefox as do I. But this is not compatible with other programs like Java I can not install or get older version on laptop. An suggestions? I am not a computer expert!

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Does Java work on this test page?
http://www.java.com/en/download/testjava.jsp

Or you can test it here - http://javatester.org/version.html