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When I try to log into the sync I get: Blocked by Content Security Policy. I only have this problem on one computer. Help?

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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?

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?

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