No I didn't switch the plugin, first I not have the iced-tea plugin installed second I not use Java in my browsers.
But to test things, I made a quick "ln -s /opt/java/lib/amd64/libnpjp2.so ~/.mozilla/plugins/" and the plugin reports to work with http://www.java.com/en/download/installed.jsp
Also when I run "java -version" in terminal I get:
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)