Examine source code of Window drops

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Window drops",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(192, 220, 255, 0.5)",
      "toolbar_text": "rgb(60, 60, 60)",
      "frame": "rgb(232, 241, 241)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.75)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 43, 208)",
      "popup": "rgba(220, 227, 239, 0.7)",
      "popup_text": "rgb(60, 60, 60)",
      "tab_loading": "rgb(0, 43, 208)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{285b2b72-e6f7-404b-86bf-f9c0f42718fd}"
    }
  }
}