Remember when Yahoo was your go-to search engine for browsing the web? It might be again soon, at least if you're a Firefox user. Mozilla and Yahoo just announced a five year deal to make Yahoo the web browser's default search engine, supplanting Google as the top item in Firefox's search bar in the United States. Mozilla says this is part of providing a more "local" experience -- until now, the company defaulted to Google search regardless of the user's country. Now the default search engine will be assigned by region: Yahoo for the United States, Yandex search for Russia and Baidu for China. Each region will have the ability to switch to other local options as well, giving Googlers a chance to switch back if they so desire.