Hi Gene, I think they shut down "My Yahoo" (it redirects over to https://www.yahoo.com/). Yahoo Mail should still work, but your description is similar to a screenshot attached to this recent post: https://support.mozilla.org/en-US/questions/1498290#answer-1750868 Over there, I suggested something to try for login problems, but possibly the issue is more similar to the following thread if many sites are affected? https://support.mozilla.org/questions/1524502 It would be helpful if you could try some of those steps and let us know how it goes.