Why did my search engine turn to yahoo?

When I was using Firefox on my PC I searched up something and instead of the traditional google it turned to Yahoo Im just looking for a clear answer, not gibberish.
Answers

Sharon: How to set or change default search engine

How to set or change default search engine: https://www.computerhope.com/issues/ch001755.htm

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Stephany#100

It happens if you are not careful with popups or while downloading something, you can always change the search provider in your browser settings.

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