Examine source code of Quick Note Sync new

{
  "manifest_version" : 3 ,
  "name" : "Quick Note Sync",
  "version" : "1.0",
  "description" : "Take notes and sync them across sessions.",
  "permissions" : [
    "storage" 
  ],
  "action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "48" : "icon48.png",
      "128" : "icon128.png"
    },
    "icons" : {
      "48" : "icon48.png",
      "128" : "icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-note-sync@gmail.com",
      "strict_min_version": "78.0"
    }
  }
}