Examine source code of Yellow Black - Lite

{
  "name": "Yellow Black",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1280px-HD_transparent_picture.png"
    },
    "colors": {
      "frame": "rgba(26, 26, 26, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(48, 48, 48, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(66, 66, 66, 1)",
      "toolbar_field_text": "rgba(194, 194, 194, 1)",
      "tab_line": "rgba(230, 192, 53, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e2bcb7c1-99a2-4aa8-8174-a3aa77fb767d}"
    }
  }
}