Examine source code of YouTube Timestamp Saver

{
  "manifest_version": 2,
  "name": "YouTube Timestamp Saver",
  "version": "1.0",
  "description": "Save and view timestamps from YouTube videos.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icons/48.png",
      "48": "icons/96.png"
    }
  },
  "options_ui": {
    "page": "view-timestamps.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05b63ac3-64f5-4a49-a7b1-7fb410c4920d}"
    }
  }
}