Refused to Connect Error

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• Web tab showing "Refused to connect"

1. In Salesforce Setup, navigate to Session Settings.
2. In the Trusted Domains section, click Add Domain.
3. Enter the following domains in the domain field/

https://.lightning.force.com
https://.visual.force.com
https://*.my.salesforce.com

4. Select Visualforce Pages for iFrame Type.
5. Click Save.

https://support.leveleleven.com/s/article/Refused-to-Connect-Error