Examine source code of fuyu live-http-headers

{
  "name": "Live HTTP headers",
  "description": "Displays the live log with the http requests headers",
  "version": "2.7",
  "permissions": [
    "debugger"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Live HTTP headers"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{54a67b2d-97df-49af-a18b-d670846aaedf}"
    }
  }
}