Comment by mintplant

For anyone else wondering about the difference between "gfx.webrender.enabled" and "gfx.webrendest.enabled": https://bugzilla.mozilla.org/show_bug.cgi?id=1365418

"gfx.webrender.enabled" enables WebRender and "gfx.webrendest.enabled" toggles on some more advanced features on top of the base level.