Examine source code of Audiolabel

{
  "manifest_version": 2,
  "name": "Audiolabel",
  "version": "1.0",
  "description": "Quick voice notes tied to the current URL/tab (≤30s). Record/play/delete/export locally using IndexedDB.",
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "microphone"
  ],
  "browser_action": {
    "default_title": "Audiolabel",
    "default_popup": "audiolabel.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b24d5c5f-660c-44ac-a8cd-27b97e3b5f25}"
    }
  }
}