From MozillaWiki

Dashboard

Where have we shipped WebRender?

Note that if a particular channel/release has the "Qualified" modifier, that means WebRender may be controlled via the qualified pref. If the modifier is not present, then it cannot be turned off via said pref.

Windows 10

Windows 7, 8, 8.1

Linux

macOS

Android

Devices where we have currently enabled in GeckoView Nightly

Adreno 5xx devices (Google Pixel, Google Pixel 2/XL, Oneplus 5, ...)

Adreno 6xx devices (Google Pixel 3, Google Pixel 4, Oneplus 6, ...)

Devices where we have currently enabled in GeckoView Beta/Release