Marissa Mayer has made a lot of changes at Yahoo since she took over about 2 years ago. She has made large acquisitions such as Tumblr and also has been extremely focused on improving Yahoo's user experience for mobile applications, including mail, weather and photo-sharing. Another key piece of her strategy is aligning Yahoo with Mozilla for search and making the Yahoo search user experience better for mobile. Google has been the default search engine on the Mozilla Firefox browser for more than a decade now. But no more. A new five-year deal between Mozilla and Yahoo now directs all U.S. Mozilla search traffic to Yahoo. Users who want to continue searching via Google must change their default settings. The deal is one of the most significant Yahoo has signed lately; it could help the company re-establish and strengthen its roots in the search industry. And it is a logical step for Mozilla. The company enables more than 100 billion searches every year by its loyal followers. But Google Chrome has even more users. It hardly made sense for Mozilla to continue sending users to Firefox’s biggest competitor. Loyal Mozilla users can expect Yahoo and Mozilla to innovate enhanced search and content experiences as well as to implement a browser makeover. For instance, a new “one-click search” feature from Mozilla will enable users to search directly on select sites such as Amazon, Bing, Twitter, and Wikipedia, as well as Google. Users will be able to search in a selected engine or in one of the sites listed in the search bar. Yahoo and Mozilla say the new search user experience will be “clean, modern and immersive.” Will users be ready to embrace it?