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CRX XPI
Not possible

Convert CRX to XPI

Can you convert CRX to XPI?
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Is it possible to convert CRX to XPI?
No - not a direct conversion.

XPI is the Firefox extension package. You cannot convert a CRX to a working XPI: besides packaging, Chrome and Firefox use different (though both WebExtensions- based) APIs and manifest details, so the extension would have to be re-authored and re-signed by/through Mozilla. db count 0 - correctly impossible.

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Last verified Oct 2026

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Converting CRX to XPI

A .CRX file and a .XPI file hold different kinds of data, so there is no direct way to turn one into the other.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.CRX Chrome Extension Package

A CRX file is a Chrome Extension Package - a signed ZIP archive containing the code and assets for a browser extension. In normal use you never see one because the Chrome Web Store installs…

Open .CRX details →
.XPI Cross-Platform Installer (Mozilla add-on package)

An XPI file is a Firefox or Thunderbird add-on package - a ZIP archive containing a browser extension or theme. Install it by dragging it onto the Add-ons Manager (about:addons) in Firefox…

Open .XPI details →