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Mozilla Firefox: WebRTC and GFX
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Mozilla ☛ Advancing WebRTC: Firefox WebRTC 2025
In an increasingly siloed internet landscape, WebRTC directly connects human voices and faces. The technology powers Audio/Video calling, conferencing, live streaming, telehealth, and more. We strive to make Firefox the client that best serves humans during those experiences.
Expanding Simulcast Support
Simulcast allows a single WebRTC video to be simultaneously transmitted at differing qualities. Some codecs can efficiently encode the streams simultaneously. Each viewer can receive the video stream that gives them the best experience for their viewing situation, whether that be using a phone with a small screen and shaky cellular link, or a desktop with a large screen and wired broadband connection. While Firefox has supported a more limited set of simulcast scenarios for some time, this year we put a lot of effort into making sure that even more of our users using even more services can get those great experiences.
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Mozilla GFX: Experimental High Dynamic Range video playback on backdoored Windows in Firefox Nightly 148
Modern computer displays have gained more colorful capabilities in recent years with High Dynamic Range (HDR) being a headline feature. These displays can show vibrant shades of red, purple and green that were outside the capability of past displays, as well as higher brightness for portions of the displayed videos.
We are happy to announce that Firefox is gaining support for HDR video on Windows, now enabled in Firefox Nightly 148. This is experimental for the time being, as we want to gather feedback on what works and what does not across varied hardware in the wild before we deploy it for all Firefox users broadly. HDR video has already been live on macOS for some time now, and is being worked on for Wayland on Linux.