Examine source code of Bookmark audio fragment

{
  "name": "bookmark-audio-fragment",
  "description": "Browser extension to bookmark fragments of audio files",
  "version": "0.1.0",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {},
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "clipboardWrite",
    "bookmarks",
    "tabs",
    "webRequest"
  ],
  "applications": {
    "gecko": {
      "id": "bookmark-audio-fragment@example.org"
    }
  }
}