Examine source code of Wonder Brush

{
  "name": "Wonder Brush",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "brush-3-final.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(92, 92, 92, 0.72)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(224, 224, 224, 0.7)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(181, 181, 181, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7dd2d5a-2c29-420a-b9bf-947639625349}"
    }
  }
}