Norton 360 is blocking Firefox 22 from launching

An hour ago I was happily zooming through the internet on Firefox 22.  Suddenly, I am no longer able to launch it at all.  My computer's only response is to flash a Norton 360 message saying "updater.exe is safe."  From what I can find (now back on the internet using IE, which I hate) there is a history of compatability issues between Norton and Firefox.  Can't we all just get along?  I don't want to update Firefox because v22 is working just fine and I don't like change.  I don't ask for these !@#$% updates that cause me so much misery & wasted time.  Please help.  I do not speak computer geek so if you offer a suggestion please translate to plain English as best you can.  thank you!