The preference() method reads or sets any user preferences in the browser.
For security reasons, reading a preference with the preference() method requires the UniversalPreferencesRead privilege.
Setting a preference with this method requires the UniversalPreferencesWrite privilege.
<html> <head> <title> Example of the preference method of the navigator object</title> </head> <body> <script language="JavaScript"> <!-- navigator.preference(security.enable_java, false); --> </script> </body> </html>
