When I was checking my Macs for the Flashback malware last week (see “,” 5 April 2012), I ran into something odd with Firefox. Mozilla’s  reported an outdated version, separate from the version reported by Safari. After some sleuthing, I discovered the problem is a caching issue in Firefox that reports the wrong version even though the correct release is installed.
I followed several different threads in Mozilla forums to figure out the problem, which has been reported as a bug, and which presumably will be corrected in an update to the Mac OS X version of Firefox. In the meantime, you can fix Firefox’s display of the Java plug-in version by following these steps:
about:supportin the Location field in Firefox.
pluginreg.datin the Trash, and empty the Trash.
The Mozilla plug-in status page will now show that the Java plug-in is up to date.