Examine source code of Leads_Tracker

{
  "manifest_version": 3,
  "version": "1.1",
  "name": "Leads Tracker",
  "action": {
    "default_popup": "browext.html",
    "default_icon": "index.jpeg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@leads.com"
    }
  }
}