| Firefox 21 | Utilu Mozilla Firefox Collection | Firefox 16 | Firefox 14 | |
| 21.0 | 137.0.1 | 16.0.2 | 14.0.1 | |
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| Freeware | Open Source | Freeware | Freeware | Licence |
| FREE | FREE | FREE | FREE | Price |
| 20.30 MB | 0.36 MB | 17.40 MB | 16.00 MB | File size |
| May 14, 2013 | Apr 11, 2025 | Oct 26, 2012 | Jul 17, 2012 | Update |
| 28 | 81 | 46 | 36 | Downloads |
| Windows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64 | Windows 11, Windows 10 32/64 bit | 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 | OS |
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