Examine source code of lightblue heaven

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "lightblue heaven",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(157, 207, 247)",
      "toolbar_text": "rgb(0, 93, 170)",
      "frame": "rgb(59, 132, 194)",
      "tab_background_text": "rgb(0, 93, 170)",
      "toolbar_field": "rgb(21, 110, 183)",
      "toolbar_field_text": "rgb(252, 254, 255)",
      "tab_line": "rgb(230, 252, 255)",
      "popup": "rgb(77, 138, 189)",
      "popup_text": "rgb(205, 247, 254)",
      "tab_loading": "rgb(230, 252, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad47ea9e-f69f-419a-9a3a-84ea2e2cfc7f}"
    }
  }
}