Examine source code of Witches Brew

{
  "name": "HD_transparent_picture",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "HD_transparent_picture.png"
    },
    "colors": {
      "frame": "rgba(140, 245, 3, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(185, 23, 255, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6481c88-39f3-44c5-8058-a2c4b656aeb8}"
    }
  }
}