Examine source code of Darkest Days

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Darkest Days",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(8, 29, 39)",
      "toolbar_text": "rgb(170, 0, 0)",
      "frame": "rgb(0, 46, 0)",
      "tab_background_text": "rgb(168, 226, 195)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(160, 0, 0)",
      "popup": "rgb(73, 73, 73)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(162, 6, 0)",
      "button_background_hover": "rgb(255, 0, 0)",
      "frame_inactive": "rgb(148, 148, 148)",
      "icons_attention": "rgb(255, 17, 0)",
      "icons": "rgb(170, 7, 0)",
      "ntp_background": "rgb(34, 0, 0)",
      "ntp_text": "rgb(255, 204, 0)",
      "popup_border": "rgb(91, 91, 91)",
      "popup_highlight_text": "rgb(255, 227, 100)",
      "popup_highlight": "rgb(164, 164, 164)",
      "sidebar_border": "rgb(209, 182, 56)",
      "sidebar_highlight_text": "rgb(255, 94, 0)",
      "sidebar_highlight": "rgb(255, 244, 193)",
      "sidebar_text": "rgb(183, 67, 0)",
      "tab_loading": "rgb(160, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d7eceb9-9556-499f-ada1-7b83090b4622}"
    }
  }
}