Examine source code of Sweets placer

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sweets placer",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(185, 185, 185, 0.4)",
      "toolbar_text": "rgb(63, 16, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 170, 159)",
      "tab_line": "rgb(201, 255, 65)",
      "popup": "rgb(255, 249, 194)",
      "popup_text": "rgb(255, 0, 99)",
      "tab_loading": "rgb(201, 255, 65)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11f2d1c9-dfdb-4654-bde9-b66b950a2f6f}"
    }
  }
}