.XPI File

The xpi file extension is associated with Firefox or Mozilla web browsers and used for its plugins and add-ons.

This is basically a ZIP file that, when opened by the Firefox browser utility, installs a browser extension. This extension applies to both Mozilla and Firefox browsers.

The XPI archive contains: installation settings (.rdf file extension), Manifest file (.manifest file extension), graphics files (.png, .jpg, .gif), and other data stored in .css, .js files.

Other web browsers based on Firefox Gecko core, such as Seamonkey, use extensions in .xpi containers. However not all Firefox extensions are compatible with other Gecko based browsers.

MIME type used for xpi firefox plugins: application/x-xpinstall

What are Firefox extensions or Firefox Add-ons?
Firefox add-ons are small pieces of software that can add new features or tiny tweaks to customize your Firefox browser. They can add new search engines or dictionaries in other languages, change the whole look of Firefox with a new theme, or much much more. Take a look around and see what add-ons can do for you.

See related links to open Firefox addons website.

An xpi file extension is Firefox plugins or add-on files. Add-ons enhance current features of the browser or add completely new functions or mini programs to the program (such as weather forecast, dictionary, password storage etc.).

How to open:

The XPI Firefox browser extension file is the native format, that is used by Mozilla Firefox to installation of browser extensions.The XPI Firefox browser extension file is ZIP archive with renamed file extension to XPI. You can rename XPI file extension to ZIP and file can be opened in compression utilities, that can open ZIP archive, such as WinRAR, WinZip, PeaZip, 7-zip and etc.

How to convert:

There is no way how to convert the XPI Firefox browser extension file in to other file format.