XPI files are Mozilla Firefox browser extension files, commonly used and created by various Mozilla applications such as the Thunderbird email application. If you’re encountering difficulties opening an XPI file or are simply curious about its contents, we’re here to elucidate the characteristics of these files and recommend software capable of handling XPI files.

What is an XPI file?

An .XPI file functions as a container for Mozilla Firefox browser extensions and is employed by different Mozilla applications like Thunderbird. Resembling zip files, these .xpi files undergo decompression upon opening, facilitating the installation of a browser extension into the Mozilla browser or Thunderbird application. Browser extensions enhance program functionality without modifying the core program itself. For instance, in Firefox, an extension might alter the New Tab page, while in Thunderbird, it could integrate with a custom calendar or email system.
To install an XPI file, users can conveniently drag and drop the file into the interface of the associated application.

How to open XPI files

If you need to open an XPI file, we’ve identified two XPI openers compatible with this file type. These tools can assist in accessing and managing the content stored within XPI files.

Various apps that use files with this extension

Certain applications are known to open specific types of XPI files. It’s important to note that different programs may utilize XPI files for varying purposes, necessitating the exploration of multiple applications to successfully open your particular file.
PowerArchiver