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
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
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
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
In a previous blog post I explained that we’re working to streamline the data consent experience for extensions and allow users to consent to sharing data with extensions directly in … Read more
Exciting news: with yesterday’s release of Firefox 138, tab groups are now available to all users! Tab groups have been a long standing feature request for users, so it’s wonderful … Read more
Greetings extension developers! We wanted to highlight this just-published blog post from our AI team where they share some exciting news – we’re shipping a new experimental ML API in … Read more
With the release of Firefox 128 comes additional Manifest V3 improvements as the engineering team continues to make cross-browser compatibility work a key focus, especially related to content scripts and … Read more
Greetings add-on developers! We wanted to provide an update on some exciting engineering work planned for the next few Firefox releases in support of Manifest V3. The team continues to … Read more