From December, Firefox will use Yahoo Search as its default search engine
However, users can still set up other default search tools such as Google, Bing, eBay, Amazon, Wikipedia . Previously, Google Search was installed by default on Firefox since 2004.
Firefox is currently the third-largest web browser in the world (with about 14%), after Internet Explorer and Chrome.
According to Business Insider, the cooperation between Mozilla and Yahoo will last for 5 years. It is estimated that in 2012, 97.9% of the revenue that Mozilla achieved was due to cooperation with search engines.