I use NIS 2010 with Firefox 3.5.
Recently I was on a page of a site I trust. I clicked on a link to get to a "contact us" page, and then clcked on a "maito" link that opened an Outlook email template, and I sent an email. Then I clicked "back" to return to the previous page and NIS instead flashed a warning that the page I was trying to go to was suspicious and would not return to it until I gave permission (which it said was not recommended unless I trusted the site). I did choose to return to the page.
If the page was suspicious, why didn't NIS give me the warning the first time I opened it -- only when I tried to navigate back to it less than a minute later? I'm pretty sure the url was the same each time. In my history I see that the Symantec warning page url has the term "suspiciousredirect" in it.
Any ideas appreciated.
EDIT: A secondary, related question: The help file says that the Miscellaneous Settings has a way to disable automatic threat submission. But I can't find any such option. I probably wouldn't disable it anyway, but where is the option? All I see is an option to disable Community Watch.