XPI File

What are XPI files and how to open them

Are you having problems opening an XPI file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your XPI files.

What is an XPI file?

An .XPI file is a Mozilla Firefox browser extension file.

XPI files are used and created by various Mozilla applications, including the Thunderbird email application and the Firefox Web browser. These .xpi files are very similar to zip files. When they are opened, the files "decompress" and install a browser extension into the Mozilla browser or Thunderbird application. An extension extends the functionality of the program without modifying the program itself. In Firefox, it could, e.g., change the New Tab page, and in Thunderbird, it could add integration into a custom calendar or email system.

To install an XPI file, a user can simply drag and drop the file into the interface of the application the file is associated with.

How to open XPI files

We have identified two XPI openers that are compatible with this specific type of XPI file.

Programs that open Mozilla Firefox browser extension files

Last updated: February 24, 2023

Various apps that use files with this extension

These apps are known to open certain types of XPI files. Remember, different programs may use XPI files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about XPI file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.