Here is a configuration that gives consistent colors in:
* Canon Digital Photo Professional
* Adobe Lightoom
* Adobe Photoshop CS2.
* Firefox 3 (new)
I'm not sure if it's all correct. But its something that seems to work for me.
Procedure:Step 1: Disable Adobe Gamma Loader.
Step 2:
Run Windows "Color Management" application.

Set the System Default by going to the "Advanced" tab, and clicking "Change System Default". Then set the following settings below.
Step 3: Set the user color management.
To enable color management in Firefox 3, see my other post
How to enable color profiles & color management in Firefox 3I hope this helps! Let me know if you other suggestions.
Thanks! Enjoy!