Just found this auto refresh extension:
https://addons.mozilla.org/extensions/moreinfo.php?id=115Never used it so I don't know if it is any good.
Norton really seems to be going down hill more and more recently, It's not at the stage where I'd recommend getting rid of it but I wouldn't renew a subscription if I had the choice.
For antivirus I use Nod32, it costs around £20 a year and is damn good (even if no one has ever heard of it). It consistently performs best in industry tests for detection rates and yet it still manages to perform scans very fast and use little resources.
For more than seven years, NOD32 remains the only antivirus system in the world that has not missed any 'In the Wild' virus in the prestigious tests performed by the international authority on virus prevention, recognition and removal