Examine source code of TabCloser

{
  "name": "__MSG_extName__",
  "version": "0.1039",
  "description": "__MSG_extDesc__",
  "permissions": [
    "storage",
    "tabs",
    "sessions"
  ],
  "options_page": "options.html",
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c1924066-5e98-4ae1-9e81-756fd60dd1b5}",
      "strict_min_version": "88.0"
    }
  },
  "default_locale": "en",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "commands": {
    "_execute_action ": {
      "suggested_key": {
        "default": "Ctrl+Shift+D",
        "windows": "Ctrl+Shift+D",
        "mac": "Ctrl+Shift+D"
      },
      "global": true,
      "description": "abc"
    }
  },
  "manifest_version": 3
}