Examine source code of Fluffle gum

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fluffle gum",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(197, 197, 197, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(14, 193, 63)",
      "tab_line": "rgb(255, 82, 221)",
      "popup": "rgb(255, 253, 241)",
      "popup_text": "rgb(19, 157, 225)",
      "ntp_background": "rgb(255, 252, 235)",
      "ntp_text": "rgb(255, 53, 111)",
      "popup_border": "rgb(114, 255, 82)",
      "toolbar_field_border": "rgb(58, 232, 255)",
      "tab_loading": "rgb(255, 82, 221)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1719c9e6-9495-4b79-8e9d-bb6c23dd2146}"
    }
  }
}