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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .RJS | Yukihiro “Matz” Matsumoto | Web Files | Ruby Javascript File | Mozilla Firefox | Mozilla |
| .RMT | The Catalina Group | System Files | Router Firmware File | Mozilla Firefox | Mozilla |
| .RSA | Various Developers | Uncommon Files | RSA Certificate File | Mozilla Firefox | Mozilla |
| .RSS | Various Developers | Web Files | Rich Site Summary | Mozilla Firefox | Mozilla |
| .SDL | Microsoft Corporation | Developer Files | Service Description Language File | Mozilla Firefox | Mozilla |
| .SESSION | Dassault Systèmes | 3D Image Files | CATIA 4 Session File | Mozilla Firefox | Mozilla |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | Mozilla Firefox | Mozilla |
| .SHTM | Opera Software | Video Files | HTML Server Side Include File | Mozilla Firefox | Mozilla |
| .SHTML | Sublime HQ Pty Ltd | Web Files | Server Side Include HTML File | Mozilla Firefox | Mozilla |
| .SLT | Mozilla | Settings Files | Mozilla User Profile Folder | Mozilla Firefox | Mozilla |
| .SPOP | Opera Software | Data Files | InterTrust SPOP File | Mozilla Firefox | Mozilla |
| .SUN | Sun Microsystems | Raster Image Files | Sun Raster Graphic File | Mozilla Firefox | Mozilla |
| .SVR | Superscape | Web Files | Compressed Virtual World | Mozilla Firefox | Mozilla |
| .TBL | Blizzard Entertainment Inc. | Data Files | StarCraft Information Table | Mozilla Firefox | Mozilla |
| .TMP | Mozilla | Backup Files | General Temporary File | Mozilla Firefox | Mozilla |
| .URL | Microsoft Corporation | Web Files | Internet Shortcut | Mozilla Firefox | Mozilla |
| .VBD | Microsoft Corporation | Web Files | Visual Basic ActiveX Document | Mozilla Firefox | Mozilla |
| .VRT | Superscape | Web Files | Virtual World | Mozilla Firefox | Mozilla |
| .WEBLOC | Apple | Web Files | Mac OS X Website Location | Mozilla Firefox | Mozilla |
| .WEBM | Video Files | WebM Video File | Mozilla Firefox | Mozilla | |
| .WML | Syncro Soft | Web Files | Wireless Markup Language File | Mozilla Firefox | Mozilla |
| .WMV | Microsoft Corporation | Video Files | Windows Media Video File | Mozilla Firefox | Mozilla |
| .WOA | Apple | Web Files | WebObjects Application | Mozilla Firefox | Mozilla |
| .WOFF | Open Source | Font Files | Web Open Font Format File | Mozilla Firefox | Mozilla |
| .XBAP | Microsoft Corporation | Executable Files | XAML Browser Application File | Mozilla Firefox | Mozilla |
| .XBL | Open Source | Developer Files | XBLite Source Code File | Mozilla Firefox | Mozilla |
| .XHTM | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Mozilla Firefox | Mozilla |
| .XHTML | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Mozilla Firefox | Mozilla |
| .XPI | Mozilla | Plugin Files | Mozilla Installer Package | Mozilla Firefox | Mozilla |
| .XPT | Mozilla | Plugin Files | Mozilla Firefox Component | Mozilla Firefox | Mozilla |
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