Examine source code of Session Panel

{
  "description": "Manage tabs and sessions",
  "manifest_version": 3,
  "name": "Session Panel",
  "version": "0.13.0.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d04582d5-3192-4296-83c1-13bfbc7b61f5}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png"
    }
  },
  "permissions": [
    "sessions",
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}