Examine source code of Proxy-toggle

{
  "description": "Toggles between proxy manual settings and none",
  "manifest_version": 2,
  "name": "Proxy-toggle",
  "version": "1.2resigned1",
  "permissions": [
    "proxy"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "philip.linghammar@gmail.com"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/page-16.png"
    }
  }
}