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Note that with some tinkering you can already manually enable WebRender, fast GPU and Rust based rendering engine, in stable Firefox

Note also that enabling webrender might make your experience (including performance) worse.

Why would that be ?

Because it's already enabled on hardware where it's known to work well but disabled where it has issues.

Yeah, it is definitely not bug free and tabs crash more often. However I still feel performance improvement and happy to live on the edge.

MacBook Pro 2017.