This feature seems like it will compete with the disable switch, and has been generally confusing to end users. In general, it seems like this function should be controlled by the browsers and not the Java plug-in.
JDK-6648887Mozilla family is unchecked in JCP, when firefox is not intalled on the system
JDK-6378580REG:Mozilla family check box is unchecked by default
JDK-6680303Unable to modify plugin association using java control panel FDCC
JDK-6961952Default Java for Browsers setting for IE can be changed even on Windows server 2008