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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.

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even more clearly:

webrender is "the stuff that works pretty ok and we can run through CI". In principle enabling webrender should get you the ~same results as not having it on, visually, modulo a few known bugs.

webrendest is "everything we're working on, no matter how broken"

It's a pretty big project so there's lots of stuff in tree that's barely functional (especially true with the layers-free pivot).

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