Hi AnthonySC9, Thank you for your question, I understand that there is an error message about an extension when you try to launch Firefox.

Try launching Firefox with the Profile Manager, if this does not allow to open a new profile and another error message comes up, make a back up of the profile Back up and restore information in Firefox profiles and try to run the installer over the current installation.

That is about the AOL toolbar that doesn't seem to be present anymore.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• http://kb.mozillazine.org/Uninstalling_add-ons
• http://kb.mozillazine.org/Uninstalling_toolbars

Try to delete the search.json file and possible search-metadata.json and search.sqlite files in the Firefox profile folder to reset the search engines to the default. You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Firefox will rebuild the search.json file from the default search engines in the "browser\searchplugins" folder in the Firefox program folder and the searchplugins folder in the Firefox profile folder.