Mapsgalaxy may have been bundled with some other application that you downloaded and installed from the internet. It seems to be an installed application and such items do not offer a "Remove" button in the Firefox Add-ons Manager but must be uninstalled from your Windows system using Windows Control Panel. You may see it on Windows in the Control Panel > Programs & Features (or Add / Remove Programs) list. If so, remove it from there. '''''It is best to perform the removal with Firefox closed'''''. *See - http://kb.mozillazine.org/Uninstalling_toolbars *See - https://support.mozilla.org/en-US/kb/Cannot%20uninstall%20an%20add-on You also may need to reset your homepage after uninstalling Mapsgalaxy *https://support.mozilla.org/en-US/kb/How%20to%20set%20the%20home%20page Source and for information only (do '''''NOT''''' download the uninstaller on this page) - http://www.2-spyware.com/remove-mapsgalaxy-toolbar.html