One possibility is that MSN is set as your home page, which is automatically displayed at startup and in new windows (Ctrl+N). This article describes how to change your home page back to the built-in Firefox Home page, or a blank page, or a different custom page. If that part of the settings page mentions that an add-on controls your home page, it should also have the option to disable that add-on. Please take a look and let us know how it goes: [[How to set the home page]]