extension

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "extension",
  "version": "0.0.1",
  "description": "extensions",
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "js": [
        "scripts.js"
      ],
      "matches": [
        "https://hangouts.google.com/*",
        "https://mail.google.com/*"
      ]
    }
  ]
}