Examine source code of Butterfly Blue & Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Butterfly Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(116, 116, 119)",
      "toolbar_text": "rgb(163, 221, 253)",
      "frame": "rgb(233, 233, 233)",
      "tab_background_text": "rgb(33, 0, 121)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(79, 79, 79)",
      "tab_line": "rgb(233, 233, 233)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "icons_attention": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgb(233, 233, 233)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e83c8cec-4ca6-4bb5-bdd7-86290ac18c50}"
    }
  }
}