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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Text Reader",
  "version": "1.0",
  "description": "A Chrome extension to read selected text on web pages",
  "permissions": [
    "scripting",
    "tts",
    "activeTab"
  ],
  "action": {
    "default_icon": {
      "16": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png"
  },
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "service_worker": "textreader.js"
  }
}