Examine source code of Close All Tabs

{
  "manifest_version": 2,
  "name": "Close All Tabs",
  "description": "Close all open tabs. Optionally close pinned tabs and incognito mode tabs. Keyboard Shortcut: Alt + W.",
  "version": "0.0.8",
  "author": "browsernative.com",
  "homepage_url": "https://browsernative.com/close-all-tabs-extension/",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "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
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{761a52d2-981d-4649-bd22-c4866898920f}"
    }
  }
}