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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "YouTube Windowed FullScreen",
  "short_name": "YouTube FullScreen",
  "description": "Watch videos on YouTube fullscreen within your browsers screen.",
  "version": "4.9",
  "action": {
    "default_icon": "icon16.png",
    "default_popup": "index.html"
  },
  "options_ui": {
    "page": "index.html",
    "browser_style": true,
    "open_in_tab": false
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "service_worker": "background.min.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "YouTube.min.js"
      ],
      "css": [
        "YouTube.min.css"
      ],
      "matches": [
        "*://www.youtube.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "index.html",
        "welcome.html",
        "update-4-7.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}