Firefox 89, WebRender, KDE Plasma and XRender

From: Graham Perrin <>
Date: Sat, 26 Jun 2021 17:40:27 UTC

Where about:support shows WebRender for compositing, is there any 
benefit to setting preferences such as the two below?

gfx.webrender.all true

gfx.webrender.enabled true

(Both are false, by default, in my Firefox 89.0.2.)


In compositor preferences for KDE Plasma, my rendering backend is XRender.

(If I choose OpenGL 2.0 or 3.1, panels lose transparency.)

Does XRender in any way negate the benefits of WebRender?