| Firefox 21 | Firefox 28 | Firefox 22 | Firefox 16 | |
| 21.0 | 28.0 | 22.0 | 16.0.2 | |
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| Freeware | Freeware | Freeware | Freeware | Licence |
| FREE | FREE | FREE | FREE | Price |
| 20.30 MB | 24.00 MB | 20.80 MB | 17.40 MB | File size |
| May 14, 2013 | Mar 18, 2014 | Jun 25, 2013 | Oct 26, 2012 | Update |
| 30 | 40 | 36 | 51 | Downloads |
| Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | OS |
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