Examine source code of Core

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Core",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(17, 12, 97)",
      "toolbar_text": "rgb(156, 112, 248)",
      "frame": "rgb(34, 30, 77)",
      "tab_background_text": "rgb(61, 65, 127)",
      "toolbar_field": "rgb(15, 17, 55)",
      "toolbar_field_text": "rgb(134, 136, 198)",
      "tab_line": "rgb(149, 112, 248)",
      "popup": "rgb(19, 19, 19)",
      "popup_text": "rgb(98, 102, 183)",
      "ntp_background": "rgb(34, 25, 77)",
      "tab_loading": "rgb(149, 112, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89f0fa89-1e44-4b3a-94f6-124e562f9ea5}"
    }
  }
}