Hello, the default Yahoo search plugin is being phased out. U.S. English users are already getting an update that hides it.
Users can install https://search.yahoo.com/opensearch.xml from a Yahoo search page if they have the optional Search Bar displayed. Or they can select among a bewildering list on http://mycroftproject.com/yahoo-search-plugins.html
To ease the transition, I uploaded a “Yahoo.com Search” search plugin this morning, and I noticed it is 6th of 6 in the queue. I don’t know what that means in hours or days, but faster would be better to respond to users on SuMo and other platforms.