Examine source code of NeverGoingToGiveYouUp

{
  "manifest_version": 2,
  "name": "NeverGoingToGiveYouUp",
  "description": "This extension plays a rick roll",
  "version": "2.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "Icon/Icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs"
  ]
}