Changes

The '''Quantum Compositor''' project will move Gecko's moves Gecko’s compositor to into its own process so GPU bugs can't crash . Since graphics driver instability is a major source of Firefox. If crashes, we expect that moving code that interacts with the GPU compositor into its own process crashes, will make Firefox can just restart the process without losing any web page state because the compositor process is only responsible for paintingmore stable. This work is tracked in {{bug|1264543}}.