Hello,

Please see How to fix preferences that won't save.

Make sure that you don't have any third party applications such as an antivirus with options set that prevent your preferences from being updated. You can also make sure that you don't have a user.js file that is resetting your settings. Please see:

• http://kb.mozillazine.org/User.js_file

The "Use custom settings for history" selection allows to see the current history and cookie settings, but selecting this doesn't make any changes to history and cookie settings. Firefox shows "Use custom settings for history" as an indication that at least one of the history and cookie settings is not the default to make you aware that changes were made. If all History settings are default then the custom settings are hidden and you see "Firefox will: (Never) Remember History". "Never Remember History" means that Private Browsing is active and "Always use private browsing mode" gets a checkmark. "Use custom settings for history" stays selected if at least one of the History or Cookie settings is not the default to make you aware that changes from the default setting have been made.

Thanks, but how do you set everything to default settings. I don't see an option for that.