Suddenly I am unable to access my mail for ********@yahoo.com through Firefox, which allows me access to other websites
I haven't a clue
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Get back to what you were doing by fixing an issue that’s interrupting your Yahoo experience. Use these steps, starting with #1, then check if your problem is resolved before moving to the next step: https://help.yahoo.com/kb/fix-problems-yahoo-website-isnt-working-sln2891.html