FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows Server 2003 R2 (5.2.3790.1830)

A DESCRIPTION OF THE PROBLEM :
The Java Console menu item disappears in Firefox after it is updated to 2.0.0.1. This is caused by the fact that the maxVersion parameter of the Java Console "extension" is set to 2.0, and not 2.0.0.* or 2.0.* (either will suffice). This issue may be present in multiple platforms.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Install Firefox 2.0
2. Install JDK/JRE 6.0
3. Update Firefox to 2.0.0.1

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Java Console menu item appears correctly after update
ACTUAL -
Software update shows "Java Console 6.0" is incompatible with 2.0.0.1 and menu item is not present after update

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Update the install.rdf file in Firefox folder\extensions\{CAFEEFAC-0016-0000-0000-ABCDEFFEDCBA} so that the maxVersion is bumped, create .xpi from folder and install created .xpi.
Posted Date : 2006-12-20 14:03:36.0

N/A

The install manifest for Java Console currently targets Firefox application with maxVersion 2.0. This causes any version of FF later than 2.0 to not being able to recognize the Java Console extension module.
Unfortunately, we cannot set maxVersion to an indefinite number later than 2.0.
Will set this maxVersion to 5.0+ to allow a big time gap.
Posted Date : 2007-01-26 00:16:03.0

Well, for the time being, try just setting the maxVersion to "2.*", which will include all versions of firefox 2.0.0.0 thru 2.9.9.9.  The next major version (version 3) is still going to be quite a while.  Just throwing up your hands and giving everyone the shaft is uncalled for.

I still don't have a java console.  This is not fixed.

This is not a "closed, fixed" bug! It re-occurs with FF 2.0.0.4. Please fix. 

This problem has been fixed in Java SE 6u2 

In the interim waiting for 6u2 to be released, for your testing
purpose, you can find the nightly of 6u2 at http://download.java.net/jdk6/binaries/.

The bundle you'd want to get is
http://download.java.net/jdk6/binaries/jdk-6u2-ea-bin-b02-windows-i58....

This same information is also mentioned at bugzilla 364390 (https://
bugzilla.mozilla.org/show_bug.cgi?id=364390) 
Roger
JavaSE

The problem still occurs with latest version of Mozilla. And also with windows vista. Cant see the java console on windows vista after installing java 6.