OS : WindowsXP-Prof_SP3 FF version 18.0.2 My default browser is FF, but not quite as expected. Url links appearing Outlook 2010 messages or appearing in website pages are mostly still opening another browser (AvantBrowser) instead of Firefox. How can I force links to access only FF ? In other words how do I prevent to open links in any other browser ? Most irritating are links appearing in Outlook 2010 messages. Those links always open in AvantBrowser, which I don't want to uninstall for the moment being. Despite the fact that I applied both procedures, according Mozilla HELP informations ! 1. Settings within FF itself 2. Settings within Windows-XP (problem here) Windows-XP refuses to modify existent current settings to the choices which I want to remain permanent... (as NOT shown in a screenshot I made ; but apparently can't be uploaded here . After OK and closing all windows,including ControlPanel, nothing has been changed. Going back to [ControlPanel>...> same window] to check if the option has been changed, my choices are gone and old settings remain unchanged ! Why ??? Like I wrote already procedure described in http://mzl.la/L8LwDs has already been done.