We're currently rewriting most of the graphics rendering of Firefox (with what is called the WebRender project). This is the first time Linux users will have hardware accelerated rendering by default, and is a pre-requisite to take real advantage of hardware-accelerated video decoding. It's enabled on some configuration in Nightly builds [0], and it's being worked on actively. If you want to know more, the graphics teams has a blog where updates are periodically posted about what is happening, often with interesting insight about the innards of a web browser rendering stack [1].
Once rendering is hardware accelerated, it makes sense to look into hardware video decoding. Doing hardware video decoding without hardware rendering roughly means we need to read back from GPU memory into main memory, composite the image in software, and then upload back to the GPU to display, which is super super inefficient.
Once rendering is hardware accelerated, it makes sense to look into hardware video decoding. Doing hardware video decoding without hardware rendering roughly means we need to read back from GPU memory into main memory, composite the image in software, and then upload back to the GPU to display, which is super super inefficient.
[0]: https://wiki.mozilla.org/Platform/GFX/WebRender_Where [1]: https://mozillagfx.wordpress.com/