Examine source code of Smoke and steam

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Smoke and steam",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(31, 34, 61, 0.34)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(152, 157, 193)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgba(54, 58, 89, 0.32)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(239, 222, 237)",
      "popup": "rgb(0, 1, 8)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_loading": "rgb(239, 222, 237)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{469e023d-cac5-483a-b25f-741b29c65f89}"
    }
  }
}