Since 57 Norton has put out Extensions (as a Norton Security user am not happy) These should be able to be added from your Norton Account Web Page also. Norton Identity Safe (stop and think before put SS # in.) https://addons.mozilla.org/en-US/firefox/addon/norton-identity-safe/ Norton Safe Web https://addons.mozilla.org/en-US/firefox/addon/norton-safe-web/ I do use this one but not finding it that useful really since have Malwarebytes sunning. Norton Safe Search Not Compatible with Firefox 57 They did come out with a Extension for 56 and I tried it. Bad Mistake. As a ex-norton Beta Tester was not happy and they took it off. can see my comments here : https://community.norton.com/en/comment/7667911#comment-7667911 So up to you.... Please let us know if this solved your issue or if need further assistance.