Examine source code of Close All Tabs

{
  "name": "Close All Tabs",
  "description": "Close all open tabs. Optionally close pinned tabs and incognito mode tabs. Keyboard Shortcut: Alt + W.",
  "permissions": [
    "tabs"
  ],
  "version": "0.0.7",
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "Close All Tabs",
    "browser_style": false
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+W"
      }
    }
  },
  "options_ui": {
    "page": "/options/options.html",
    "open_in_tab": true
  },
  "manifest_version": 2,
  "homepage_url": "https://browsernative.com/close-all-tabs-extension/",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b9d8b2a-bbc9-406e-86db-b8594782f612}"
    }
  }
}