Examine source code of showTabs

{
  "manifest_version": 2,
  "name": "showTabs",
  "version": "1.1resigned1",
  "description": "Shows the saved tabs. Works with saveTabs extension.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "show@saveTabs"
    }
  },
  "icons": {
    "48": "icons/showTabs.svg",
    "90": "icons/showTabs.svg"
  },
  "sidebar_action": {
    "default_panel": "sidebar/panel.html",
    "default_icon": "icons/showTabs.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "author": "caspgin",
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "MacCtrl+Shift+L"
      }
    }
  }
}