Hi,

You can try to update Norton. Please see this.

Support

i changed the properties of my mozilla firefox 13 to run in comptability mode for windows xp service pack 2 i right clicked on my firefox icon to properties then the compatability tab

and checked the box windows xp service pack 2 i was able to get my add ons and enable them in my firefox tools restart the browser and my norton 360 V6 toolbar is now working

hope this helps users of windows xp 8/11/12