Examine source code of Proxy Walker

{
  "manifest_version": 2,
  "name": "Proxy Walker",
  "version": "0.1",
  "description": "Extension to switch between the proxy-states, by walking trough them. You can do so by clicking the button or pressing <Alt>+<P>",
  "applications": {
    "gecko": {
      "id": "proxy-walker@hofrichter.net"
    }
  },
  "developer": {
    "name": "hofrichter.net"
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "proxy",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {},
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+P"
      }
    }
  }
}