Examine source code of Canuck+

{
  "manifest_version": 2,
  "name": "Canuck+",
  "description": "Hey there, Bud. Are ya ready for the PLUS Canadian internet, Eh?",
  "version": "1.0",
  "author": "Haobin Alturo Chen Liu",
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_action": {
    "default_icon": "img/icon16.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*"
      ],
      "js": [
        "js/program.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{676000a6-7385-45f3-a701-08568b319a45}"
    }
  }
}