I had been having endless problems get the Site Checking part of Web security to work in Firefox since V5. Sessions with chat and searches on the forum did not work.

Solution if you are a NoScript addon user:

The "site check" functionality uses JavaScript code which executes on browser open to makes a call to "conduit.com". NoScript blocks this and only briefly puts it in the recently block list. It does not put it in the main list and does not changes its status icon to the red circle and slash icon. So you are not aware what just happen.

The fix is add "conduit.com" to NoScript's wishlist.

Support Chat was not aware of this solution. I asked Support whether there was the equivalent of "zonealarm.conduit.com" to provide tighter security, but there is none.