Examine source code of Witch's Brew

{
  "name": "Witch's Brew",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "WitchesBrew.jpg"
    },
    "colors": {
      "frame": "rgba(28, 26, 39, 1)",
      "tab_background_text": "rgba(255, 217, 156, 1)",
      "toolbar": "rgba(255, 228, 224, 0.09)",
      "bookmark_text": "rgba(255, 204, 212, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(235, 255, 173, 1)"
    }
  }
}