The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.

Since the latest version 66.0.3 (64-bit) I get messages similar to the following. Often there is no specific error code. ------------ Secure Connection Failed An error occurred during a connection to secure.tesco.com. SSL peer reports incorrect Message Authentication Code. Error code: SSL_ERROR_BAD_MAC_ALERT The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. ------------- Ironically the html source shows the page is there and complete. Under 'Preferences->Privacy & Security I have unchecked 'Block dangerous and deceptive content" to no effect. All is fine under Safari. This is a critical issue as I am having to abandon my much preferred Firefox for Safari, which does not have issues. MacOS 0.14.4 (18E226)