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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .MAB | Mozilla | Uncommon Files | Mozilla Address Book | Mozilla Thunderbird | Mozilla |
| .MAFF | Mozilla | Web Files | Mozilla Archive Format File | Mozilla Firefox | Mozilla |
| .MAP | id Software | Game Files | Quake Engine Map File | Mozilla Firefox | Mozilla |
| .MAR | Microsoft Corporation | Database Files | Microsoft Access Report | Mozilla Firefox | Mozilla |
| .MBOX | Unknown Developer | Data Files | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .MFL | Verity Software House | Data Files | ModFit LT Analysis Report File | Mozilla Firefox | Mozilla |
| .MHT | Various Developers | Web Files | MHTML Web Archive | Mozilla Firefox | Mozilla |
| .MHTM | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Mozilla Firefox | Mozilla |
| .MHTML | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Mozilla Firefox | Mozilla |
| .MIM | Internet Engineering Task Force | Encoded Files | Multi-Purpose Internet Mail Message File | Mozilla Thunderbird | Mozilla |
| .MIME | Various Developers | Encoded Files | Multi-Purpose Internet Mail Extension | Mozilla Thunderbird | Mozilla |
| .MJPEG | Various Developers | Video Files | Motion JPEG Video File | Mozilla Firefox | Mozilla |
| .MJPG | Various Developers | Video Files | Motion JPEG Video File | Mozilla Firefox | Mozilla |
| .MNG | Various Developers | Raster Image Files | Multiple Network Graphic | Mozilla Firefox | Mozilla |
| .MODS | Mozilla | Developer Files | Mozilla XULRunner File | Mozilla Firefox | Mozilla |
| .MON | Mozilla | Backup Files | Firefox Monday Bookmark Backup File | Mozilla Firefox | Mozilla |
| .MOZ | Mozilla | Web Files | Mozilla Cache File | Mozilla Firefox | Mozilla |
| .MSF | Mozilla | Uncommon Files | Mail Summary File | Mozilla Thunderbird | Mozilla |
| .MSG | Microsoft Corporation | Text Files | Saved Email Message | SeaMonkey | Mozilla |
| .MSPX | Microsoft Corporation | Web Files | Microsoft ASP.NET Web Page | Mozilla Firefox | Mozilla |
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