Intercept site

Last week I suddenly got redirected to the Cox location intercept site when I opened Firefox and went to my home page: ww2.cox.com/myconnection/home.cox.  This only happens on Firefox and not IE.  The tech folks had me flush the DNS and clear my cache to no avail.  It happens when I initially open the browser and try to bring up the home page.  I then have to enter my Zip code to get to my home page.  Any assistance will be appreciated.  I made no changes to Firefox 26 that would explain this action.  Help?