Examine source code of eXCITE

{
  "manifest_version": 2,
  "name": "eXCITE",
  "description": "Make citation on the fly Havard Referencing",
  "version": "1.3",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab"
  ]
}