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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .10 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .12 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .13 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .14 | PTC | Backup Files | Versioned Pro/Engineer Project File | Mozilla Firefox | Mozilla |
| .15 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .17 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .19 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .3B2 | Mozilla | Data Files | Firefox Extension Backup Extension | Mozilla Firefox | Mozilla |
| .4 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .509 | Microsoft Corporation | Web Files | Internet Security Certificate | Mozilla Firefox | Mozilla |
| .ABM | Unknown Developer | Audio Files | Music Album | Mozilla Firefox | Mozilla |
| .ADP | Microsoft Corporation | Database Files | Access Project Extension | Mozilla Firefox | Mozilla |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Mozilla Thunderbird | Mozilla |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Mozilla Firefox | Mozilla |
| .ASP | Microsoft Corporation | Web Files | Active Server Page | Mozilla Firefox | Mozilla |
| .ASPX | Microsoft Corporation | Web Files | Active Server Page Extended ASP.NET Script | Mozilla Firefox | Mozilla |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Mozilla Firefox | Mozilla |
| .BAK | Various Developers | Backup Files | General Backup File | Mozilla Firefox | Mozilla |
| .BCI | Belarc | Data Files | Belarc Advisor Report File | Mozilla Firefox | Mozilla |
| .BML | Various Developers | Web Files | Bean Markup Language File | Mozilla Firefox | Mozilla |
| .BOK | Pearson | Data Files | TestGen Testbank File | Mozilla Firefox | Mozilla |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .BR | Mozilla | Web Files | Brotli Compressed File | Mozilla Firefox | Mozilla |
| .CACHE | Various Developers | Uncommon Files | Cache File | Mozilla Firefox | Mozilla |
| .CAL | Newera Software Technology, Inc. | Raster Image Files | CALS Raster File | Lightning | Mozilla |
| .CER | Microsoft Corporation | Web Files | Internet Security Certificate | Mozilla Firefox | Mozilla |
| .CFM | Adobe Systems Incorporated | Web Files | ColdFusion Markup File | Mozilla Firefox | Mozilla |
| .CHK | Sophos | Data Files | InterCheck Checksum Database | Mozilla Firefox | Mozilla |
| .CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | Mozilla Firefox | Mozilla |
| .CMS | Opera Software | Web Files | Content Management System Web Page File | Mozilla Firefox | Mozilla |
| .CPC | Cartesian Products, Inc. | Raster Image Files | CPC Compressed Image File | Mozilla Firefox | Mozilla |
| .CRT | Mozilla | Web Files | Security Certificate | Mozilla Firefox | Mozilla |
| .CSP | RadGs Software | Web Files | Concept Server Page | Mozilla Firefox | Mozilla |
| .DBM | Adobe Systems Incorporated | Web Files | ColdFusion Server File | Mozilla Firefox | Mozilla |
| .DER | Mozilla | Web Files | DER Certificate File | Mozilla Firefox | Mozilla |
| .DLL | Microsoft Corporation | System Files | Dynamic Link Library | Mozilla Firefox | Mozilla |
| .DML | Sybase, Inc | Web Files | DynaScript File | Mozilla Firefox | Mozilla |
| .DO | Unknown Developer | Web Files | Java Servlet | Mozilla Firefox | Mozilla |
| .DUMP | Microsoft Corporation | System Files | Dump File | Mozilla Firefox | Mozilla |
| .ECE | Escenic | Web Files | Escenic Dynamic Web Page | Mozilla Firefox | Mozilla |
| .EML | Microsoft Corporation | Web Files | E-Mail Message | Mozilla Thunderbird | Mozilla |
| .ENV | Adobe Systems Incorporated | Data Files | Adobe Dictionary Data File | Lightning | Mozilla |
| .EXTRA | Uncommon Files | Google BreakPad Crash Log Extra File | Mozilla Firefox | Mozilla | |
| .FAQ | The Document Foundation | 3D Image Files | Frequently Asked Questions Document | Mozilla Firefox | Mozilla |
| .FBU | Chuck Baker | Backup Files | FEBE Firefox Backup File | Mozilla Firefox | Mozilla |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Mozilla Firefox | Mozilla |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Mozilla Firefox | Mozilla |
| .HTMLS | Open Source | Web Files | HTML With Server-Side Include | Mozilla Firefox | Mozilla |
| .ICS | IronCAD, LLC | CAD Files | IronCAD 3D CAD Drawing File | Lightning | Mozilla |
| .IHTML | Mozilla | Web Files | Inline HyperText Markup Language File | Mozilla Firefox | Mozilla |
| .IIM | Ipswitch, Inc. | Executable Files | iMacro Macro File | Mozilla Firefox | Mozilla |
| .IWS | JetBrains | Developer Files | IntelliJ IDEA Web Page | Mozilla Firefox | Mozilla |
| .J | Oracle Corporation | Developer Files | Java Source File | Mozilla Firefox | Mozilla |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Mozilla Firefox | Mozilla |
| .JA | Trainz portal | Game Files | Jet Archive | Mozilla Firefox | Mozilla |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | Mozilla Firefox | Mozilla |
| .JBK | Juno | Backup Files | Juno Backup File | Mozilla Firefox | Mozilla |
| .JFIF | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Mozilla Firefox | Mozilla |
| .JHTML | Oracle Corporation | Web Files | Java HTML Web Page | Mozilla Firefox | Mozilla |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Mozilla Firefox | Mozilla |
| .JMH | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Mozilla Firefox | Mozilla |
| .JP2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Core Image File | Mozilla Firefox | Mozilla |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Mozilla Firefox | Mozilla |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Mozilla Firefox | Mozilla |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Mozilla Firefox | Mozilla |
| .JPG-LARGE | Zoner Software | Raster Image Files | Large JPEG Image | Mozilla Firefox | Mozilla |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Mozilla Firefox | Mozilla |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | Mozilla Firefox | Mozilla |
| .JSB | Freedom Scientific | Developer Files | JAWS Script Binary File | JavaScript | Mozilla |
| .JSM | Mozilla | Settings Files | Firefox JavaScript Module | Mozilla Firefox | Mozilla |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Mozilla Firefox | Mozilla |
| .JSP | Oracle Corporation | Web Files | Java Server Page | Mozilla Firefox | Mozilla |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Mozilla Firefox | Mozilla |
| .JVS | Opera Software | Web Files | JavaScript Proxy Autoconfig File | Mozilla Firefox | Mozilla |
| .LASSO | LassoSoft | Web Files | Lasso Database-Driven Web Page | Mozilla Firefox | Mozilla |
| .LDIF | Mozilla | Data Files | LDAP Data Interchange Format File | Mozilla Thunderbird | Mozilla |
| .LOCK | Mozilla | Uncommon Files | Lock File | Mozilla Firefox | Mozilla |
| .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 |
| .NA2 | Mozilla | Web Files | Netscape Address Book File | SeaMonkey | Mozilla |
| .NMF | ESRI | GIS Files | ArcGIS Explorer Map File | Mozilla Firefox | Mozilla |
| .ODC | Microsoft Corporation | Settings Files | Office Data Connection File | Mozilla Firefox | Mozilla |
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