Hello prw101

if you successfully install java ( http://java.com/en/download/help/mac_install.xml ) do the test to see if working ( http://java.com/en/download/testjava.jsp )

did you download java from java site or from : http://support.apple.com/downloads#java_for_os_x_lion ?

thank you

Java 7 works with Safari, but not with Firefox. I downloaded it from the Java site-the Apple site only has a previous version of Java & it can't be downloaded.

try to Re-initializing the plugins database and check it again

if the above does not solve the issue see if you can manually copy the contents of the java folder into Mozilla Firefox\plugins (i don't know the precisely position in mac)

thanks again

I have this problem too! Tried everything mentioned above. doesn't work. Can developer look into this issue?

I reported this issue as a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=813803