http://xxx.nortonpro.com/buy.php?l=0&o=1&v=100&c=100&campid=103273&s=1&k=1708649608
After disabling all add-ons this comes up twice whenever I click on show unread post, show replies to your posts. It also shows up in my Firefox tool bar.
Captured the full page but got an error message saying the file is to large.