Examine source code of Modern Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Modern Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(19, 19, 19)",
      "toolbar_text": "rgb(112, 167, 248)",
      "frame": "rgb(3, 6, 37)",
      "tab_background_text": "rgb(141, 187, 255)",
      "toolbar_field": "rgb(37, 37, 41)",
      "toolbar_field_text": "rgb(68, 146, 237)",
      "tab_line": "rgb(112, 138, 248)",
      "popup": "rgb(34, 36, 38)",
      "popup_text": "rgb(53, 109, 255)",
      "ntp_background": "rgb(30, 37, 53)",
      "tab_loading": "rgb(112, 138, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{519a9664-f263-48c5-a5f8-af40d3a625ed}"
    }
  }
}