Looks like NS only blocks malicious sites within only few browsers, I guess they are IE, Chrome and Firefox (32bit?).
While using some other browser, like this for example http://www.palemoon.org/palemoon-x64.shtml - NS does not block anything.
Let's see, here is test page which is supported by Symantec: http://www.amtso.org/feature-settings-check-phishing-page-intro.html
When I open it with IE, result is:
Fraudulent Web Page Blocked
You attempted to access:
http://www.amtso.org/feature-settings-check-phishing-page.html
This web page is a known fraudulent web page. It is recommended that you do NOT visit this page.
But after visiting it with Firefox-based Palemoon browser mentioned above, test page opens without any warning. Which means NS leaves me exposed to any web threat or phishing website.
Any comments? Using IE, vanilla FF or Chrome is not an option, sorry.