Mozilla Firefox Sync is a service that allows you to synchronize your bookmarks, history, passwords, Firefox add-ons and open tabs with another Firefox browser. This can be useful when changing computers or syncing your browser settings between a computer and a mobile phone.
In this way, you can take your Firefox bookmarks, history, passwords, add-ons and open tabs data wherever you go. All you do is set up Firefox Sync on your main computer and the data is then safely stored on the Firefox servers and synchronized automatically from that point. When you set up Firefox Sync on your work computer, your Firefox Browser data will be automatically synchronized with your home or main computer.
This makes surfing the web on your PC easily than ever, letting you carry your Internet browser customizations with your wherever you go on your mobile phone, just the way you left it at home. Since you passwords are also stored, you can save valuable time when logging into websites or typing in long URLs from your mobile smartphone. Firefox Sync is also a two-way street, so if you bookmark a web site from your work computer or even your phone, the information will also automatically be saved on your computer at home.
Mozilla uses advanced security measures to make sure your information saved on their servers cannot be seen by others, even Mozilla. Each user is given a max data limit of 25MB, but 99.9% of users never even come close to this much. If you happen to reach the limit however, Firefox will provide a warning letting you know that you will not be able to sync any new data until you delete older entries. If you happen to need more space, you can request it on the Mozilla Services Account web page.