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Firefox 133 on Windows 11. Firefox 1.0 was released for Windows 95, as well as Windows NT 4.0 or later. Some users reported the 1.x builds were operable (but not installable) on Windows NT 3.51. [170] The version 42.0 release includes the first x64 build. It required Windows 7 or Server 2008 R2. [171]