Examine source code of Hermes Sync

{
  "manifest_version": 3,
  "name": "Hermes Sync",
  "version": "0.16.0",
  "description": "Sync bookmarks between browsers via shared file or cloud.",
  "permissions": [
    "bookmarks",
    "alarms",
    "storage",
    "activeTab",
    "identity"
  ],
  "host_permissions": [
    "https://*.firebaseio.com/*",
    "https://*.googleapis.com/*",
    "https://*.firebaseapp.com/*",
    "https://api.hermesync.me/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Hermes Sync",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hermes-sync@mausv.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "bookmarksInfo",
          "personallyIdentifyingInfo"
        ]
      }
    }
  }
}