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manifest.json

{
  "manifest_version": 2,
  "name": "YouTube Theater Toggle (local)",
  "version": "1.0.2",
  "description": "One-button local extension: always force YouTube into theater mode.",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Toggle YouTube Theater (local)"
  },
  "permissions": [
    "storage",
    "tabs",
    "*://*.youtube.com/*",
    "*://youtu.be/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-theater-local@santi.local",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://youtu.be/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}