What is Sync Bookmarks?
Sync Bookmarks is a Firefox add-on that enables you to save and synchronize your bookmarks using Google Drive. With this handy tool, you can easily access your bookmarks from any device and keep them updated across all platforms.
Save bookmarks and sync with Google Drive
Sync Bookmarks is relatively safe to use as it requires very minimum permissions.
Sync Bookmarks has earned a fairly good reputation and likely can be trusted.