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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "ESL Helper",
  "description": "Learn English anytime",
  "version": "1.0",
  "action": {
    "default_popup": "main.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "service_worker": "service_worker.js"
  },
  "permissions": [
    "storage",
    "contextMenus"
  ]
}