Examine source code of Mini Proxy Switcher

{
  "manifest_version" : 2 ,
  "name" : "Simple Proxy Switcher",
  "version" : "1.0",
  "description" : "Toggle proxy on and off like FoxyProxy.",
  "icons" : {
    "48" : "icon-48.png",
    "96" : "icon-96.png"
  },
  "permissions" : [
    "proxy" ,
    "storage" ,
    "tabs" 
  ],
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "48" : "icon-48.png",
      "96" : "icon-96.png"
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "proxy-switcher-anupamsingh@example.com",
      "strict_min_version": "91.1.0"
    }
  }
}