Examine source code of Sidebar Notepad

{
  "version": "1.0.4resigned1",
  "name": "Sidebar Notepad",
  "description": "Sidebar editable notepad with password encrypted (AES) content saved to browser local storage.",
  "author": "Moris Papasmadov",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/sidebar-notepad/",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "morisdov@sidebarnotepad",
      "strict_min_version": "54.0a1"
    }
  },
  "permissions": [
    "storage"
  ],
  "sidebar_action": {
    "default_title": "Sidebar Notepad",
    "default_icon": "icons/notepad-48.png",
    "default_panel": "sidebar/panel.html",
    "browser_style": false
  },
  "icons": {
    "16": "icons/notepad-16.png",
    "32": "icons/notepad-32.png",
    "48": "icons/notepad-48.png"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Z"
      }
    }
  }
}