Muokkaa Firefoxia

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.

Opi kuinka tehdä lisäosa

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

Julkaise lisäosasi

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


Resources for a successful launch

You've built your extension and are ready to publish it. What comes next? Check out our tips for creating an appealing listing page, getting your extension featured on, finding answers to development questions, and staying up-to-date with news and events relevant to extension developers.

View Resources for Publishers

Viimeisimmät uutiset

Lue lisää blogistamme


  • Web-Ext

    A command line tool to build, run, and test extensions.

  • Lisäosan kelpuutus

    Automated code tests for your add-on.

  • Yhteensopivuustesti

    Tarkista nähdäksesi onko laajennuksesi yhteensopiva Firefoxin kanssa.

  • Live Testing

    Temporarily install your extension in Firefox for live testing and debugging.