Examine source code of Laugh Tracks

{
  "manifest_version": 2,
  "name": "Laugh Tracks",
  "version": "1.0",
  "description": "Play laugh tracks and boos over any content.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/laugh-48.png"
    }
  },
  "icons": {
    "48": "icons/laugh-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{468f3b27-9fd3-4671-b814-3c51a6f9468e}"
    }
  }
}