Examine source code of Sort Tabs by URL

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "0.11resigned1",
  "applications": {
    "gecko": {
      "id": "jid0-uRZpLu7VtYEF3IY7A2TpX21yj3A@jetpack"
    }
  },
  "default_locale": "en",
  "browser_action": {
    "default_title": "__MSG_extensionName__",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png"
    },
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "menus",
    "tabs"
  ],
  "commands": {
    "sort-tabs": {
      "suggested_key": {
        "default": "Ctrl+Shift+O",
        "mac": "Command+Shift+O"
      },
      "description": "__MSG_extensionCommand__"
    }
  },
  "icons": {
    "48": "icon-48.png"
  }
}