User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130 If you have multiple profiles, and you change Advanced -> Quick Launch checkbox in the preferences, this setting will take effect throughout all profiles. If this is deemed a "feature" and not a bug, then this behavior should be noted underneath the Quick Launch checkbox. Reproducible: Always Steps to Reproduce: 1. Create multiple profiles 2. Use one profile, and check the Quick Launch checkbox 3. Close mozilla completely, and then go into the another profile 4. un-check the Quick Launch checkbox 5. Close mozilla completely, and then go into the original profile 6. You will see that the checkbox is now un-checked Expected Results: I thought the setting of this checkbox would be on a per profile basis, instead of a global basis.
the panels itself doesn't belong to preferences. AFAIK: You can't set if per profile basis since Mozila must place the quicklaunch link in the autostart for that user. It should work if you switch the logged in User , it doesn't make sense otherwise.
agreed, setting the preference sets a registry key which will be in use for all profiles working as designed