Firefox update & now unable to access the internet

My Mozilla Firefox recently automatically updated and now I can't access the internet.  From what I have researched, it seems that Norton firewall will not allow the updated Firefox through. I may need to delete Firefox as one of the programs the Norton firewall lets through, and then re-allow the new Firefox through.  I have read on this site that I can change what the fire wall will allow through by going to "settings" on Norton.  I can't find "settings" on my Norton. Any help would be appreciated.  The programs I use act differently on Explorer and it's frustrating.  Thank you in advance.