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Https only fault
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Hmm, this can happen if for some reason you were using a proxy or VPN or security software that sends its own certificate to Firefox instead of the actual website certificate.
We normally advice to use 'No Proxy' for the connection settings in this case.
- Settings -> General -> Network: Connection -> Settings
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
That does not explain why when I closed and reopened FF within a minute with the same configuration worked.