Briefly

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Briefly",
  "description": "Enhance your Google search results",
  "version": "1.2.4",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "include_globs": [
        "*://*.google.*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "default_locale": "en",
  "icons": {
    "16": "/icons/icon16.png",
    "48": "/icons/icon48.png",
    "128": "/icons/icon128.png"
  },
  "permissions": [
    "<all_urls>"
  ]
}