Examine source code of Motivations-Parol

{
  "manifest_version": 2,
  "name": "Motivations-Zitat",
  "version": "1.0",
  "description": "Erhalte täglich ein motivierendes Zitat!",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "motivations-zitat@beispiel.de"
    }
  }
}