Examine source code of Football Wallpapers

{
  "manifest_version": 2,
  "name": "Football Wallpapers",
  "version": "1.0",
  "description": "A collection of football-related wallpapers",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe2ac1e6-2411-4485-8b54-ecb462e0adc2}"
    }
  }
}