Examine source code of Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(55, 72, 81)",
      "toolbar_text": "rgb(123, 204, 196)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(0, 255, 229)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(123, 204, 196)",
      "tab_line": "rgba(0, 0, 0, 0)",
      "popup": "rgb(55, 72, 81)",
      "popup_text": "rgb(123, 204, 196)",
      "tab_loading": "rgb(123, 204, 196)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a88645ab-5430-462d-9785-77ccf2329742}"
    }
  }
}