I use FIrefox on about 14 computers. I had to reformat/reinstall windows on this computer. Before this I used sync. Now when I click on the sign in button on the sync options page it gives the message: Blocked by Content Security Policy This page has a content security policy that prevents it from being loaded in this way. Firefox prevented this page from loading in this way because the page has a content security policy that disallows it. This doesn't happen on any other computer, and Firefox help does not address this problem anywhere. How can I get around this so I can sync this computer to my other computers? Before retiring I consulted full time on internet security. I am not a pedestrian. I'm a pro and I'm not accustomed to being stymied, but I am definitely stymied now! Help, anyone?