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Firefox 151 is out now, and brings with it some tasty new web platform features: 🎉 Container style() queries 🎉 Web Serial API 🎉 Document Picture-in-Picture API 🎉 keyboardLock on requestFullscreen …and more! developer.mozilla.org/en-US/docs/M...
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This article provides information about the changes in Firefox 151 that affect developers. Firefox 151 was released on May 19, 2026.
developer.mozilla.org
Firefox 151 release notes for developers (Stable) - Mozilla | MDN
Firefox for Web Developers