Firefox Sync is a feature that allows you to synchronize your bookmarks, history, passwords, settings, and open tabs across multiple devices using Firefox browser. It uses a cloud-based service to store and share your data securely between the devices.
To use Firefox Sync, you create a Firefox account and sign in to it on each device. Once signed in, you can choose what data you want to sync and it will automatically synchronize across all devices. For example, if you bookmark a website on your desktop computer, it will appear on your laptop and mobile device as well.
Firefox Sync uses end-to-end encryption to keep your data private and secure. It also gives you the option to set a custom passphrase, which adds an extra layer of security to your synced data. Additionally, you can manage and remove devices that are connected to your Firefox account.
Overall, Firefox Sync is a convenient and useful feature for those who use Firefox across multiple devices and want to keep their data organized and accessible.