Examine source code of Dr. Freunds Sidebar

{
  "manifest_version": 2,
  "name": "Dr. Freunds Sidebar",
  "version": "2.0",
  "description": "Sidebar von Dr. Freunds Multiversum (www.drfreund.net).",
  "applications": {
    "gecko": {
      "id": "sidebar@drfreund.net",
      "strict_min_version": "63.0"
    }
  },
  "icons": {
    "48": "icons/multiversum_48.png",
    "96": "icons/multiversum_96.png"
  },
  "sidebar_action": {
    "default_title": "Dr. Freunds Sidebar",
    "default_panel": "sidebar.htm",
    "default_icon": {
      "16": "icons/sidebar_16.png",
      "32": "icons/sidebar_32.png"
    },
    "open_at_install": true
  }
}