Enhanced Tracking Protection causing problems
If Enhanced Tracking Protection is on when accessing email on att.yahoo.com, I cannot open my contacts list. If I turn off protection the contacts list will display.
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This means the Enhanced Tracking Protection is blocking essential content. Yahoo appears to host CSS and/or JavaScript files on servers that are on ETP lists you currently have enabled. You can try the Basic setting for ETP that blocks less. There is always a risk that you block too much if you use content blocking, either via builtin ETP or via content blocking extensions and in such a case you need to disable content blocking.