The most dangerous 'helpful' utility you can install, at least with Firefox. First the thing deleted Utorrent, dangerous malware it claimed, then the installer when I tried to reinstall. Finally is blocked several sites, one being this one. I just, after almost a month of trying, located and deleted the last Mal utility, Malwarebytes Browser Guard, a few minutes ago. Suddenly I was able to log back in.

DO NOT USE MALWAREBYTES, it is Malware to the third degree!