Customize Firefox

Add-ons let millions of Firefox users enhance their browsing experience. If you know HTML, JavaScript, and CSS, you already have all the necessary skills to make a great add-on.

Learn How to Make an Add-on

Port a Chrome Extension

Firefox supports WebExtension APIs, which in most cases are compatible with the extension APIs supported by Chrome, Opera and Edge, so your extensions will run in Firefox with just a few changes.

Learn How

Publish Your Add-on

Have an add-on ready? Submit your extension or theme to be listed on addons.mozilla.org or sign and distribute your extension on your own.

Sign In

Evolution in Add-on Development

WebExtensions are now the standard for add-on development in Firefox. You'll need to update your legacy add-ons to stay compatible.

Learn How

Latest News

Read more in our Blog

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