hello james, please try this: go to firefox > help > troubleshooting information, click on profile folder/show folder and close all firefox windows afterwards. a windows explorer window should open up - in there delete the file named user.js - it is used to overwrite your custom preferences.

How to fix preferences that won't save

Solution, delete user.js refer to here for more info

• https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save#w_user-js-file-overriding-preferences

Thank you for the help. I did not know that the user.js was causing the issue. Once I got rid of that file, I went back into about:config, reset the incredibar, restarted Firefox, and rechecked for incredibar and it finally gone.

Again, thank you for the help. -James Sullivant

Hope this video helps you to get rid of it. How to Remove Mystart By Incredibar Toolbar from Firefox

edit additional information and preliminary steps suggested by a moderator ~J99

1. Read Reset Firefox preferences to troubleshoot and fix problems
   note you will lose some information including open tabs,
   and any extensions will be uninstalled.
2. You may wish to
   Close all unnecessary open tabs.
   Boookmark any open tabs, and the home websites of all Firefox extensions that you have installed.
   See also Find and install add-ons to add features to Firefox