Nova is here: what changes for your Firefox theme
On September 29, Firefox 157 shipped Nova, the biggest refresh of the Firefox interface since Proton back in 2021. The browser frame is cleaner, the sidebar plays a bigger role, … Read more
How the publicSuffix API was created
Firefox 153 ships the new publicSuffix WebExtensions API. This API lets extensions ask the browser for the registrable domain (eTLD+1) of a hostname. It uses the browser’s built-in, always-up-to-date copy … Read more
Firefox 153 WebExtensions API updates
We had a bumper release of WebExtensions API updates in Firefox 153. To start, there is a permissions change that affects how your extensions access local files. We then have … Read more
WebExtensions API Changes (Firefox 149-152)
Intro Hey everyone, we’ve been working on some exciting changes, and want to share them with you. But first, let me introduce myself. I am Christos, the new Sr. Developer … Read more
How Your Feedback Shapes the Firefox Add-ons Experience
Hey everyone! I’m Christos Bacharakis, and I’ve recently joined Mozilla as the new Add-ons Senior Developer Relations Engineer. I’m here to help developers overcome technical challenges so your extension visions … Read more
Presenting 2025 Firefox Extension Developer Award Recipients
Extensions have long been at the heart of the Firefox — providing users with powerful options to personalize their browsing experience. Nearly half of all Firefox users have installed at least … Read more
New Recommended Extensions arrived, thanks to our community curators
Every so often we host community-driven curatorial projects to select new Firefox Recommended Extensions. By gathering a diverse group of community contributors who share a passion for the open web … Read more
Announcing data collection consent changes for new Firefox extensions
As of November 3rd 2025, all new Firefox extensions will be required to specify if they collect or transmit personal data in their manifest.json file using the browser_specific_settings.gecko.data_collection_permissions key. This … Read more
Developer Spotlight: Fox Recap
“What if we did a Spotify Wrapped for your browser?” wondered a group of Cal State Monterey Bay computer science students. That was the initial spark of an idea that … Read more
