Very useful. But it's a shame that Norton created the need for this several years ago when they removed the site-safety icons that used to appear next to each Google-search result in Firefox (even though the behavior remained unchanged in Chrome). This add-on restores some degree of "advance-warning" in Firefox because if you're suspicious of a link you can right-click and see Norton's safety assessment *before* opening it (or doing manual copy 'n paste into Norton's Safeweb site).