Should I uninstall the 7 old versions of Java that show on the add on page?

firefox keeps crashing. I have 7 old versions of Java listed on the add on page, should I uninstall them

Do you mean multiple Java Console extensions in Tools > Add-ons > Extensions ?
You can uninstall (remove) the Java Console extensions and disable the Java Quick Starter extension, you do not need them to run Java applets.
See http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions
See also http://www.java.com/en/download/help/quickstarter.xml - What is Java Quick Starter (JQS)? What is the benefit of running JQS? - 6.0
Disable the Java Quick Starter extension: Tools -> Addons -> Extensions<br />
Control Panel -> Java -> Advanced tab -> Miscellaneous -> Java Quick Starter (disable)

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