Mozilla: Firefox's Gecko Media Plugin & EME Architecture, Accessibility, Firefox 68 Beta 10 Testday Results
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Chris Pearce: Firefox's Gecko Media Plugin & EME Architecture
For rendering audio and video Firefox typically uses either the operating system's audio/video codecs or bundled software codec libraries, but for DRM video playback (like Netflix, Amazon Prime Video, and the like) and WebRTC video calls using baseline H.264 video, Firefox relies on Gecko Media Plugins, or GMPs for short.
This blog post describes the architecture of the Gecko Media Plugin system in Firefox, and the major class/objects involved, as it looked in June 2019.
For DRM video Firefox relies upon Google's Widevine Content Decryption Module, a dynamic shared library downloaded at runtime. Although this plugin doesn't conform to the GMP ABI, we provide an adapter to allow it to be run through the GMP system. We use the same Widevine CDM plugin that Chrome uses.
For decode and encode of H.264 streams for WebRTC, Firefox uses OpenH264, which is provided by Cisco. This plugin implements the GMP ABI.
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Hacks.Mozilla.Org: How accessibility trees inform assistive tech
The web is accessible by default. It was designed with features to make accessibility possible, and these have been part of the platform pretty much from the beginning. In recent times, inspectable accessibility trees have made it easier to see how things work in practice. In this post we’ll look at how “good” client-side code (HTML, CSS and JavaScript) improves the experience of users of assistive technologies, and how we can use accessibility trees to help verify our work on the user experience.
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QMO: Firefox 68 Beta 10 Testday Results
As you may already know, Friday June 14th – we held a new Testday event, for Firefox 68 Beta 10.
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