Firefox users have
noticed that when using Google search, a fairly large block appears directly in the list, recommending to change the browser settings. Attached is a picture explaining how to quickly change the search from Yahoo to Google:
Previously, users have already
noted that Google recommends including your search, but not in such an aggressive form:

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In November 2014, Marissa Meyer
reported that Yahoo would be the default search for Firefox browsers in the US, and not a Google search for a long time. The contract was concluded for a period of five years. According to comScore estimates, in the United States, the proportion of Google search queries is 67%, Bing processes approximately 20%, and Yahoo search 10%. The income of the Mozilla Foundation from embedding the search engines into the browser is the greatest. Thus, in the financial
statement of the fund, published in 2012, it was stated that out of $ 311 million of income, $ 309 million were received just due to contributions from such companies Google, Bing, Yahoo, Yandex, Amazon.
StatCounter
reports that many Firefox 34 users have returned from Yahoo search back to Google search, so such intrusive persuasions of the search giant look redundant. Probably, they were caused by comScore analytical
reports , from which it followed that Google lost 1.6% of requests in the US, and Yahoo, on the contrary, increased its share by the same 1.6%.