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Firefox lost users during “failed” Yahoo search deal, says Mozilla CEO
(arstechnica.com)
A place to discuss the news and latest developments on the open-source browser Firefox
That's Bing now. Bing back in the day was bad. Not Yahoo bad, but still bad.
Separate of that though, Yahoo search is just bad so I do believe this. There are other viable options and were a few back in 2017; Yahoo was not one of them.