Ready to 
Fix Java apps failing to run in Firefox on Windows 7
Robert Hallock
September 11, 2009 12:50 AM ET in Tech
If you’re a Firefox user running Windows 7, you may have noticed that Java applets do not seem to run correctly. Who’s to blame, and how do you fix it? We’ve got the answers.
The problem lies with the Java Runtime Environment (JRE) installer which places the Firefox Java plugins on the hard drive, but never moves them to Firefox’s plugins directory. How can the browser load Java applets if Java never gave it the plugins to do so? It can’t, according to Java Tester, which couldn’t tell we were running JRE build 1.6.0_15-b03.
Hi, Java! Hello? ...Java?
Fixing Java’s firefox plugins
Fortunately, the fix is simple: All you have to do is copy npjpi160_xx.dll and npoji610.dll from C:\Program Files (x86)\Java\bin to Firefox’s plugins directory located in C:\Program Files (x86)\Mozilla Firefox\plugins.
We copied npjpi160_15.dll and npoji610.dll to Firefox's plugins folder
After copying the files to the right location, Windows 7, Java and Firefox became the best of friends:
Oh, Java! THERE you are!
And that’s it, folks. Thirty seconds of shuffling files is all it takes to slap Java back into working condition on this increasingly popular software combination.
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