Examine source code of 11 Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "11 Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(112, 167, 248)",
      "frame": "rgb(147, 142, 201)",
      "tab_background_text": "rgb(94, 100, 153)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(47, 66, 218)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(98, 102, 183)",
      "ntp_background": "rgb(4, 4, 34)",
      "tab_loading": "rgb(47, 66, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{114b1c86-2868-4ae2-8207-017046ca11f1}"
    }
  }
}