It will miss certain websites that are malicious,because the way Norton works is that it needs to know where the file came from!
It's web filter is not the best,but the other components are top notch>>Sonar etc!!
Go to
hxxp://malc0de.com/database/
Try a few links, in a VM offcourse, and although it may not flag a particular site as malicious, if a malicious file is downloaded it will catch it!You will have a hard time infecting your pc with Norton!
I have thrown everything at it including executing known malware, and it blocked/removed everything!
Take a peak here:
http://malwaretips.com/threads/torrentlocker-11-samples-2015-06-13.47010/
Scroll down to my post!
Cheers!!
PS: Set all settings to
Agressive