Firefox is an open-source web browser developed for Windows, OS X and Linux by the Mozilla Foundation and its subsidiary, the Mozilla Corporation.
Originally called Phoenix, Firefox underwent many changes and developments before it was released in 2002. Firefox includes tabbed browsing, spell checking, incremental find, live bookmarking, Smart bookmarks, a download manager, private browsing, location-aware browsing, and an integrated search system. Firefox uses a sandbox security model and limits scripts from accessing data from other web sites based on the same-origin policy. It also uses SSL/TLS to protect communications with web servers using strong cryptography when using HTTPS protocol.
As of February 2014, Mozilla had approximately 450 million users and ranged between 12 percent and 22 percent of worldwide usage, making it the third most popular web browser.