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manifest.json

{
  "manifest_version": 2,
  "name": "Prevent Accidental Close",
  "version": "1.0",
  "description": "Warns before closing Firefox, even with a single tab.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b94e1f0d-6c36-4112-940f-8b0a9c06e9ca}"
    }
  }
}