Examine source code of CBRetro

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "CBRetro",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-035-ec6e2e3635b86a13a7ebee9a1390e7e7.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(65, 24, 142)",
      "toolbar_text": "rgb(255, 70, 244)",
      "frame": "rgb(65, 24, 142)",
      "tab_background_text": "rgb(255, 255, 0)",
      "toolbar_field": "rgba(255, 0, 241, 0.6)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 241)",
      "popup": "rgb(65, 24, 142)",
      "popup_text": "rgb(98, 102, 183)",
      "button_background_active": "rgba(255, 255, 0, 0.51)",
      "icons": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 0, 241)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{118ac541-7260-4364-91f2-15ec3105139c}"
    }
  }
}