On win platforms I highly recommend using JavaRA to manage JRE installs 
http://raproducts.org/wordpress/
>-----Original Message-----
>From: Support for Support Discussion List 
>[mailto:[log in to unmask]] On Behalf Of Richard Godbee
>Sent: Thursday, August 18, 2011 1:20 PM
>To: [log in to unmask]
>Subject: Re: firefox 6 issues with java 6 update 25/26
>
>On Aug 17, 2011, at 2:34 PM, Knobl, Geoffrey wrote:
>
>> The latest version of Firefox 6 claims Java Console 6.0.25 
>and 26 don't work with it.  It's just the console but I'd 
>thought I'd try Banner anyway.  It runs fine for me on regular 
>IN Banner.  
>
>The Java plug-in should still run applets correctly, even with 
>the Java Console extension disabled.
>
>The manifest for the Java Console extension specifies a max 
>Firefox version of "5.0+".  I tried changing it to "6.0+" just 
>to see if the extension would work, but it didn't.
>
>The JRE's installer doesn't do a wonderful job of cleaning up 
>old JREs after an upgrade.  If you don't want a bunch of old, 
>useless Java Console entries cluttering up Firefox's extension 
>list, look inside the "C:\Program Files\Mozilla 
>Firefox\extensions" directory and find the directories with names like:
>
>{CAFEEFAC-vvvv-0000-uuuu-ABCDEFFEDCBA}
>
>The "vvvv" will be the Java version ("0016" for Java 1.6), and 
>the "uuuu" will be the update number ("0026" for Update 26).
>
>Delete all of these "CAFEEFAC" directories to get rid of all 
>of the Java Console extensions in Firefox.  You'll probably 
>never need to use the console, but if by some chance you *do* 
>need the console, you can still access it by right-clicking 
>the Java icon in the system tray after an applet loads.
>
>Richard
>