Examine source code of Zen Tab Sorter

{
  "manifest_version": 2,
  "name": "Zen Tab Sorter",
  "version": "2.91",
  "description": "Sorts tabs by domain and title. Hotkey: Alt+S.",
  "permissions": [
    "tabs",
    "tabGroups",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "sort-tabs": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "Sort all tabs and groups by domain then title"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_title": "Sort all tabs (Alt+S) — Right-click for settings",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{e8ef475c-3452-4fff-92f5-39a689787cd2}"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}