Comment 6 for bug 484148

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Micah Gersten (micahg) wrote : Re: apparmor-profiles freezes Firefox when using Java applets (Sun JRE)

No one should disable apparmor entirely. You can disable the Firefox profile if you need to per the release notes:
http://www.ubuntu.com/getubuntu/releasenotes/910overview#New%20profiles

It is disabled by default in Karmic.