What Is WebRender?
For those of you who don’t know, WebRender is a 2D rendering engine that utilizes your graphics chip to accelerate the performance of Firefox. It’s similar in workings to the contemporary Direct3D engine, only that it’s better as it internally uses OpenGL API. WebRender basically makes the pages load faster and the whole browser feels a lot smoother to navigate. There is no inherent downside to WebRender, apart from it being unstable at launch and causing issues on extremely low-end hardware.
WebRender Is Your Only Option Going Forward
But, Mozilla is going one step ahead and on top of now shipping WebRender on all devices and making it the default, it is completely removing Direct3D and the option to switch back to it. Firefox 93 will remove the gfx.webrender.force-legacy-layers preference, making it impossible to fallback on layers. Furthermore, the environment variable MOZ_WEBRENDER=0 that does essentially the same thing will also be rendered (no pun intended) ineffective in Firefox 93 and going forward. Unless gfx.webrender.software is set to true, you’ll get either HW-WR or SW-HW and MOZ_WEBRENDER=1 depending on your specific hardware configuration. Firefox 92 will launch on September 7th and will be succeeded by Firefox 93 soon after. Firefox 92 will solidify WebRender as the default and the next version will hammer that in further by taking away the option to disable WebRender. And, while this may sound really anti-consumer, it’s not. WebRender is objectively a better rendering engine and it’s been a long time since it debuted. By now, it’s stable and doesn’t bring up any issues for users. So, if anything, the full shift to WebRender is a good thing as Firefox had always been building up to this since 2019.
