I am having issues loading yahoo main page, however I am able to load and read without problems pages like sports.yahoo_com, news.yahoo_com, and others. I currently am having this issue on my home pc as well are my cell using the cell towers (No on Wifi). I am using Firefox 79.0, Windows 10 2004 19042.421 Enterprise. I have a pfsense box and i have verified that it is not the source of the problem.
I can access it if changing to the 18.104.22.168 as my dns. I have checked several are they down sites only one reports an issue but most report as up. I live in the northwest of the US.