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Firefox 4

Web browser
Mozilla Firefox 4 is a version of the Firefox web browser, released on March 22, 2011. The first beta was made available on July 6, 2010; Release Candidate 2 was released on March 18, 2011. It was codenamed Tumucumaque, and was Firefox's last... Wikipedia
Initial release date: March 22, 2011
Engine: Gecko
Size: 11.9 MB – Windows; 26.8 MB – Mac OS X; 13.2 MB – Linux