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XPI CRX
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Convert XPI to CRX

Can you convert XPI to CRX?
Verified by Adam B.· reviewed by FE Editorial ·updated Jul 26, 2026
QUICK ANSWER
Is it possible to convert XPI to CRX?
No - not a direct conversion.

There is no file-level conversion from .xpi to .crx because the manifest keys, browser APIs, and signing systems differ between Firefox and Chrome. Check the Chrome Web Store for an existing Chrome version of the add-on.

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert XPI to CRX?

An XPI is a ZIP archive of a WebExtension for Firefox/Thunderbird, signed by Mozilla's AMO infrastructure. A .crx is a Chrome extension package with a proprietary binary CRX3 header and a Google-trusted cryptographic signature. Beyond the file wrapper, manifest.json keys and API calls differ between the two platforms - renaming or repacking the file produces nothing Chrome will load.

About these formats

.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 →
.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 →

Quality & what to watch

  • Renaming .xpi to .crx or repacking the ZIP produces nothing Chrome will load - Chrome verifies the CRX3 binary header and cryptographic signature.
  • AMO-signed .xpi files contain Mozilla's certificate in META-INF/; this carries no authority in Chrome.
  • If you are the developer, audit manifest.json for incompatible keys and replace browser.* calls with their chrome.* equivalents, then package and submit to the Chrome Web Store.

Frequently asked questions

Can I rename an XPI to CRX to load it in Chrome?
No - Chrome requires a valid CRX3 binary header and cryptographic signature that renaming cannot provide.
Do Firefox and Chrome extensions share any code?
Most JavaScript logic can be shared; the main porting work is adapting manifest.json keys and testing API differences between the browser.* and chrome.* namespaces.
Where can I find a Chrome version of a Firefox add-on?
Search the Chrome Web Store (chromewebstore.google.com) by the add-on's name - many developers maintain parallel releases for both browsers.