Examine source code of Auto Close All Tabs

{
  "manifest_version": 2,
  "name": "Auto Close All Tabs",
  "version": "1.2",
  "description": "Closes all tabs after a specified period of inactivity. This version is specifically tailored to be Docker-proof and work reliably with environments like jlesage/docker-firefox.",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_title": "Auto Close All Tabs"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-close-all-tabs@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}