Examine source code of The Long Quiet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "The Long Quiet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(173, 144, 144, 0.3)",
      "toolbar_text": "rgb(238, 196, 196)",
      "frame": "rgb(66, 60, 60)",
      "tab_background_text": "rgb(204, 137, 135)",
      "toolbar_field": "rgba(125, 104, 104, 0.75)",
      "toolbar_field_text": "rgb(238, 196, 196)",
      "tab_line": "rgb(218, 111, 108)",
      "popup": "rgb(66, 60, 60)",
      "popup_text": "rgb(238, 196, 196)",
      "tab_loading": "rgb(218, 111, 108)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e05d1253-3f8d-4951-a1ea-e3015dcfb350}"
    }
  }
}