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.XPI File Extension

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File TypeMozilla Installer Package

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Rare Uncommon Average Common Very Common
CategoryPlugin Files


This file is saved in a binary format, which requires a specific program to read its contents.


Compressed installation archive used by various Mozilla applications, including Firefox, Thunderbird, and SeaMonkey; may contain the primary components installed with the software, or may contain an software extension, such as a Web-browser plug-in.

More Information

XPI files can often be installed by simply dragging and dropping the file onto an open Web browser window. The Mozilla software uses a component called XPInstall, (which includes Mozilla installer script) to install the XPI packages.

Programs that open XPI files
Mozilla Firefox
Mozilla Thunderbird
Mozilla SeaMonkey
Mozilla Firefox
Mozilla Thunderbird
Mozilla SeaMonkey
Mozilla Firefox
Mozilla Thunderbird
Mozilla SeaMonkey
Updated 1/17/2012

FileInfo - The File Extensions Database

This page contains information about the .XPI extension and its known file associations. Our goal is to help you understand what an XPI file is and how to open it.

The Mozilla Installer Package file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and therefore do not publish any information we have not verified.

If you would like to suggest any additions or updates to this page, please let us know!