![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Firefox_4.png/640px-Firefox_4.png&w=640&q=50)
Firefox 4
Firefox browser released in 2011 / From Wikipedia, the free encyclopedia
Mozilla Firefox 4 is a version of the Firefox web browser, released on March 22, 2011.[6] The first beta was made available on July 6, 2010; Release Candidate 2 (a base for the final version) was released on March 18, 2011.[7][8] It was codenamed Tumucumaque,[9] and was Firefox's last large release cycle. The Mozilla team planned smaller and quicker releases following other browser vendors.[10] The primary goals for this version included improvements in performance, standards support, and user interface.[11]
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![]() Firefox 4.0 on Windows 7. | |
Original author(s) | Mozilla Corporation |
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Developer(s) | Mozilla Corporation Mozilla Foundation |
Initial release | March 22, 2011 (2011-03-22)[1] |
Final release | 4.0.1
/ April 28, 2011; 13 years ago (2011-04-28) |
Repository | |
Written in | C++, JavaScript,[2] CSS,[3][4] XUL, XBL |
Engine | Gecko |
Operating system | Cross-platform |
Size | 11.9 MB – Windows 26.8 MB – Mac OS X 13.2 MB – Linux |
Available in | 81 languages |
Type | Web browser FTP client |
License | MPL/GNU GPL/GNU LGPL[5] |
Website | firefox |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Mozilla_Firefox_4_Custom.png/640px-Mozilla_Firefox_4_Custom.png)
There was one security update in April 2011 (4.0.1) and version 4 of the browser was made obsolete by the release of Firefox 5 in June 2011.[12]
This marked a transition to giving much less weight to major version numbers, with 5 more major version numbers used by December of that year (5, 6, 7, 8, and 9), compared to 4 in nearly a decade of Firefox development (1, 2, 3, 4).