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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Text Counter",
  "description": "This is a simple text counter.",
  "version": "2.1",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "content-script.js"
      ],
      "matches": [
        "https://*/*"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "select.js"
      ],
      "matches": [
        "https://*/*"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_title": "Text Counter",
    "default_icon": "icons/light/icon-128.png",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "icons": {
    "16": "icons/light/icon-16.png",
    "32": "icons/light/icon-32.png",
    "48": "icons/light/icon-48.png",
    "128": "icons/light/icon-128.png"
  }
}