Examine source code of DuckDuckGo Enhancer

{
  "manifest_version": 2,
  "name": "DuckDuckGo Enhancer",
  "version": "1.4",
  "description": "DuckItUp integrates search google button and movie rating system. Open-Source",
  "short_name": "DuckItUp",
  "author": "Sayak Sen",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://duckduckgo.com/*",
        "https://safe.duckduckgo.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "script.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "https://www.omdbapi.com/"
  ]
}