But in previous comment, the library menu is apparently Basic, not WebRender. gfx.webrender.debug.new-frame-indicator does not show up.
Bug 1656211 Comment 12 Edit History
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~~But in previous comment, the library menu is apparently Basic, not WebRender. gfx.webrender.debug.new-frame-indicator does not show up.~~ Edit: No it's OpenGL, layers.acceleration.draw-fps does show up.