Hey, I think this site's audience is technical enough that it's okay to just give them the name of the option: about:config -> gfx.webrender.all -> true
Go to about:support and search for WebRender to check if it worked.
Works great for me with Kubuntu 19.10 / Mesa / AMD. It didn't work when I tried it a couple of months ago.
Go to about:support and search for WebRender to check if it worked.
Works great for me with Kubuntu 19.10 / Mesa / AMD. It didn't work when I tried it a couple of months ago.