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manifest.json

{
  "manifest_version": 3,
  "name": "YouTube Vertical Center Captions",
  "version": "1.3",
  "description": "Forces YouTube CC to appear in the center with adjustable position and offset.",
  "icons": {
    "96": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Caption Settings"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-custom-captions@my-extension.com",
      "strict_min_version": "113.0"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ]
}