Examine source code of grinch

{
  "name": "grinch",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "grinch.jpg"
    },
    "colors": {
      "frame": "rgba(3, 3, 3, 1)",
      "tab_background_text": "rgba(17, 102, 12, 1)",
      "toolbar": "rgba(8, 23, 3, 0.53)",
      "bookmark_text": "rgba(17, 102, 12, 1)",
      "toolbar_field": "rgba(6, 38, 9, 0.38)",
      "toolbar_field_text": "rgba(94, 255, 0, 1)",
      "tab_line": "rgba(255, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{919a4211-5199-4194-b347-13fbc43a172b}"
    }
  }
}