Answie

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "homepage_url": "http://intelligentsearchassistant.com/",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "2023.04.11",
  "permissions": [
    "activeTab",
    "<all_urls>",
    "*://*/*",
    "storage"
  ],
  "web_accessible_resources": [
    "about.html",
    "loading.gif"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/*",
        "*://www.google.com.tr/*",
        "*://www.google.com.br/*",
        "*://www.google.com.au/*",
        "*://www.google.fr/*",
        "*://www.google.de/*",
        "*://www.google.co.uk/*",
        "*://www.google.ie/*",
        "*://www.google.ca/*",
        "*://www.google.es/*",
        "*://www.google.cl/*",
        "*://www.google.nl/*",
        "*://www.google.se/*",
        "*://www.bing.com/*",
        "*://yandex.com.tr/*",
        "*://yandex.ru/*",
        "*://www.yandex.com/*",
        "*://yandex.com/*",
        "*://yandex.net/*",
        "*://*.yandex.net/*",
        "*://duckduckgo.com/*",
        "*://*.duckduckgo.com/*"
      ],
      "js": [
        "js/search-result-script.js"
      ],
      "css": [
        "css/search-result-script.css"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content-script.js"
      ],
      "css": [
        "css/content-style.css"
      ]
    }
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "__MSG_extName__",
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    }
  },
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}