为FirefoxOS设计开发的一款等宽字体，结合了FirefoxOS的很多特性。值得称道的是该字体在设计时就兼顾了在各种分辨率下的易读性。
| 文件名 | MD5值 | 文件大小 |
| FiraMono-Bold-1.ttf | abbe89bd522af0765f67d19bbef382bd | 201KB |
| FiraMono-Medium-2.ttf | 5a5afe3541d5456462a0bcb346fab34d | 169KB |
| FiraMono-Regular-3.ttf | d616f619c088ed9428d76343a2c6b2ed | 170KB |
| FiraSans-Bold-4.ttf | 6028e19089deb3cf7a60d0d00e4638ba | 427KB |
| FiraSans-BoldItalic-5.ttf | e52a31177b297691a585c49bd4731452 | 437KB |
| FiraSans-Book-6.ttf | 8507ff266cbf9e610b925669235c8ac5 | 394KB |
| FiraSans-BookItalic-7.ttf | f173823151e6bc79814366091551cf61 | 402KB |
| FiraSans-Eight-12.ttf | 4f49a1a14fac6f700061c5e193771ef2 | 380KB |
| FiraSans-EightItalic-13.ttf | cc15bf13cdb7b6fa55fa9a221cf7418f | 389KB |
| FiraSans-ExtraBold-14.ttf | e836b60c5959654ce369b4ddee002320 | 436KB |
| FiraSans-ExtraBoldItalic-15.ttf | 80d6fdbbd2a6efa1e8a41cfd19a7aaa1 | 446KB |
| FiraSans-ExtraLight-16.ttf | 4aebf82bbcd92c831be8486d7bf092e0 | 385KB |
| FiraSans-ExtraLightItalic-17.ttf | 64566157c83e9f46ac7a6452dc7f7d3b | 393KB |
| FiraSans-Four-18.ttf | 58be8e0fb351cf264961679304061a95 | 375KB |
| FiraSans-FourItalic-19.ttf | 9f874a939f5714b8566ab2a4e52f94af | 389KB |
| FiraSans-HairItalic-21.ttf | 416fcb12f11ebe751538deeed6d7885d | 401KB |
| FiraSans-HeavyItalic-23.ttf | 2eb742f29e5fed7087f1fcfccfaed49e | 456KB |
| FiraSans-Hair-25.ttf | 530647d74ec136702e5dbd60b854b3a8 | 390KB |
| FiraSans-Heavy-26.ttf | bfa8d731eb16203d69c895c02997a13f | 447KB |
| FiraSans-Italic-28.ttf | a4fef367e83f653c1e0eb6c122338adb | 401KB |
| FiraSans-Light-29.ttf | 271c6d46b715703ad05e20e270a5f7e8 | 387KB |
| FiraSans-LightItalic-30.ttf | cbbb2042d64920e9d2ae8fec84c904a8 | 394KB |
| FiraSans-Medium-31.ttf | 54b83b537f536ffab4528d8a635f865d | 395KB |
| FiraSans-MediumItalic-32.ttf | 2b70d3d73007e2afa7325cc211ca7efc | 403KB |
| FiraSans-Regular-33.ttf | b0aa1958e34c16cede8af5643a9c285c | 394KB |
| FiraSans-SemiBold-34.ttf | a40c65276c46be222b4d7180e96b728c | 427KB |
| FiraSans-SemiBoldItalic-37.ttf | 88a3623bc30ef02a023bd212e6a6c1ec | 436KB |
| FiraSans-Thin-38.ttf | d56a90660a25e3f62d7d9469bcddbf21 | 386KB |
| FiraSans-ThinItalic-39.ttf | 76a4427c3133fd135a1c79e10845abc0 | 393KB |
| FiraSans-Two-40.ttf | 7759a082d6cbeef29752bb48fb2a6915 | 373KB |
| FiraSans-TwoItalic-41.ttf | ca710005d29b7ad1f9896d06d16bcd33 | 382KB |
| FiraSans-Ultra-42.ttf | 14f6eff31bf9566ed69d7af90bf49810 | 473KB |
| FiraSans-UltraItalic-43.ttf | b104259572e6fc78a2ef82851e507a94 | 485KB |
| FiraSans-UltraLight-44.ttf | 2a810c8dd8a9dd7307489c13c1e20b5d | 384KB |
| FiraSans-UltraLightItalic-46.ttf | 273a1aab041818d0cd00cd888d8b5128 | 392KB |
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