Examine source code of Easy to do

{
  "manifest_version": 3,
  "name": "Easy to do",
  "version": "1.0",
  "description": "our extension Easy to do is to let users finding alot of nice offers in one place worldwide",
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "your-extension-id@easytodo.com"
    }
  }
}