You can use the short form firefox.exe -P to get the Profile Manager.

Easiest is to create a desktop shortcut to launch the Profile Manager or create s shortcut for each profile if you only have a few.

• http://kb.mozillazine.org/Shortcut_to_a_specific_profile
• http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
• http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile

Thank-you very much Cor-el :)

Unchecking "Don't ask at startup" in Profile Manager resolved the issue. Evidently, it is checked by default.

When you create multiple profiles for Firefox, Thunderbird or Mozilla Suite/SeaMonkey, the last selected profile for that Mozilla application is automatically used, unless you uncheck the "Don't ask at startup" option in the Profile Manager.

http://kb.mozillazine.org/Shortcut_to_a_specific_profile

Thank you Cor-el :)

When you have multiple Firefox profiles, you can select the profile of your choice when starting Firefox by unchecking the Profile Manager option, "Don't ask at startup". This will always start the Profile Manager when starting Firefox.

http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox