Another user has also reported this issue. This may be a temporary issue on Yahoo's end and if that is the case, there is nothing that Mozilla can do.

Please consider contacting the Yahoo support team for further assistance.

Yahoo works perfectly with IE 11 (what I am using now) so would not seem to be a Yahoo problem. Also Yahoo is Firefox's search partner so they have a lot of skin in this game and they sure don't need anymore people leaving Firefox for Chrome and Edge . And that is where I am headed if I can't find a fix.

Sometimes a website will work correctly in some browsers, but not others. This is because every browser reads a website slightly different. It is possible that the Yahoo developers made a small mistake that causes an error in Firefox.

Since the same issue occurs on four other installations on Firefox, it is most likely an issue on Yahoo's end. Unfortunately, there is nothing that Mozilla can do to repair this issue at this time.

If you contact Yahoo, I'm sure that their developers will be happy to patch the issue in a timely manner.

In the meantime, sorry for any inconvenience.

Tried Yahoo support they said try Firefox... In any case, it was Firefox and I found a fix by using the "Refresh Firefox" button. Whatever the issue was that fixed it on two of my computers so far. Got to update my setting again but that's 10m, compared to the 10 hours I spent trying everything else that's nothing.

Thanks for the help!