Google Search
Yandex is facing web search competition in Russia from Google Search. Google Chrome, Russia's most popular web browser, uses Google Search as its default search engine. In June 2012, Mozilla Firefox, the world's third most popular web browser, signed a deal to replace its default search engine Yandex Search with Google Search. As Yandex Browser's "Smartbox" uses Yandex Search as its default search engine, the browser will help Yandex compete for Russian search market share.