Examine source code of Emma Minimalist

{
  "name": "Emma Minimalist",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "test.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{521aa990-5c6f-4fe5-a936-8048d3640f31}"
    }
  }
}