Environment: Windows 7 32bit (With All update) , Firefox 19.0.1
JRE 7 update 10
JavaFX 2.1.1 (It contains Java plug-in of JRE 7 update 5)
Oracle added a feature to install of Java FX via auto-update at 7u5 and 7u6, and removed it at 7u6 (At 7u6, Java FX is included in JRE, not another application)
As a result of it , on some user's PC, two plug-ins are installed.
1. C:\Program Files\Oracle\JavaFX 2.1 Runtime\bin\plugin2\npjp2.dll
2. C:\Program Files\Java\jre7\bin\plugin2\npjp2.dll
Auto-update of JRE does not update plugin of Java FX .
As result of it, on some environment, Java plug-in in Java FX is still OLD, even if Java plug-in of JRE.
When path of npjp2.dll is bundled with JavaFX , don't use it.
And use plugin bundled with JRE
npjp2.dll is already registered to Firefox , Firefox uses it even if plugin in bundled with JRE exists and it is later than plugin bundled with Java FX.
The Plugins/Java component is for Oracle's issues in case they monitor those bugs which I doubt.
*** Bug 824329 has been marked as a duplicate of this bug. ***