Examine source code of Sleep Fox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sleep fox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(98, 105, 123, 0.46)",
      "toolbar_text": "rgb(252, 101, 0)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.47)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(252, 101, 0)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(252, 101, 0)",
      "icons": "rgb(252, 101, 0)",
      "ntp_text": "rgb(252, 101, 0)",
      "tab_loading": "rgb(252, 101, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{08a20252-b4ce-4bd9-a26a-501a2ec8c6c5}"
    }
  }
}