Remove button/ login assistant won't open

Hi.

 

I'm running windows 7 and using Firefox 21.0  I have 2 questions for you.  My Norton toolbar has a "share" button for an addon I downloaded and don't know how to get rid of it.  I didn't download it from Firefox.  This button, if it worked, would let me share links and such by clicking the button then choosing how to share it (FB, Twitter, Gmail, etc)  The only other buttons on the bar are Norton home page, Safe web, Vault Open, and Login Assistant.  How can I get rid of the Share button.  I can't find anything on it.  My other issue is that the Login Assistant doesn't always open when I click on it.  The Vault Open button works every time.  Also, when LA does open, the info isn't in any sort of order. Can I alphabetize it somehow?

 

Thanks!

 

KJW