`Potential Identity Leak` showing for netflix.com

One browser tester had the following warning when visiting Netflix once. I couldn't reproduce (no STR), but there are several things to unpack here:

• NoScript is not introduced and might seem strange if you don't know what it is: you have a downloaded a browser, and you get a popup following a entirely different graphical identity. The user could potentially even think they've been hacked.
• information about your identity might be acquired by mullvad.net is scary