Examine source code of simple todo popup

{
  "manifest_version": 3,
  "name": "simple todo popup",
  "description": "simple todo popup",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefoxtodolist@gowtham.live",
      "strict_min_version": "42.0"
    }
  },
  "icons": {
    "64": "icons/icon.png"
  },
  "permissions": [],
  "action": {
    "default_icon": {
      "64": "icons/icon.png"
    },
    "default_popup": "browserAction/popup.html",
    "default_title": "simple todo popup"
  }
}