Mozilla Preparing To Test WebRender With "Qualified" Linux Users

Written by Michael Larabel in Mozilla on 10 April 2019 at 12:09 AM EDT. 31 Comments
While Linux users can today manually enable WebRender support for their Firefox installations, Mozilla is making the necessary adjustments to begin experimenting with enabling this Rust-written GPU-based rendering element for "qualified" Linux devices.

Mozilla isn't yet attempting to enable WebRender by default everywhere but for experiment purposes to have the ability to enable it for a reasonable sub-set of users. What's being deemed "qualified" at this point are systems matching all of the following criteria:

- Running Intel graphics with Mesa 18.2 or newer... No NVIDIA or Radeon graphics at this time, but just Intel with the i965 Mesa driver. Mesa 18.2.8 is the specific version requirement to match what shipped in Ubuntu 18.04 LTS.

- Running a resolution of 3440 x 1440 or less... No 4K fun for now.

So assuming you are running with Intel graphics on Mesa 18.2.8+ and not using a 4K/5K display, with the latest Firefox Nightly builds you could soon find yourself using WebRender if you didn't already enable it. The change is outlined and pending via Bug #1543217. Manually forcing WebRender can be done for all users via the MOZ_WEBRENDER=1 environment variable.
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Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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