Adding trusted sites for Firefox
Steps
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In Firefox, enter
about:configin the URL address bar. -
Click Accept the Risk and Continue.
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In the Search bar, enter
network.negotiate. -
Click the Pencil icon for network.negotiate-auth.trusted-uris.
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In the field that opens, enter the host name of the AD Connect host.
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Click the Save icon.
Result
The name of the AD Connect host is displayed as the value of network.negotiate-auth.trusted-uris.