Removed NAV-Still Get Error Msg When Firefox Starts

I removed NAV from my Mac, but I still get error message every time I start Firefox: "This version of Firefox is not supported by Norton Confidential. You will not be protected while browsing the Web. Norton Confidential cannot protect you while you use thei version of Firefox. Phishing Protection requires Firefox 1.5 or later."   Firefox 15.0, OS X 10.8.1

 

Since I'm no longer protected by Norton Confidential, I really don't want to see this error message.

 

NAV caused serious problems with my Mac that required 2 calls to Apple support, 2 trips  to the Genius Bar and one long tech support call to Symantec - to help me remove the **bleep** thing - and it is still causing me grief.