gecko_samples.json into https://profiler.firefox.com/ To control the output filename, set the PROFILE_OUTPUT environment variable. To control the sampling rate (default 10ms), set the SAMPLING_RATE environment Thread B Layout B Embedder Constellation Thread Compositor WebRender Font Cache Image Cache Resource Managerlists, renders display lists to tiles and finally composites the final image to a surface some sandboxing techniques (for example, proxying all OpenGL calls to a separate process). I/O and resource management Web pages depend on a wide variety of external resources, with many mechanisms of retrieval