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    Firefox Sync

    Components and Services

    Sync refers to a family of related components and services which provide synchronization of data between Mozilla application instances. These components and services include:

    Firefox Sync Client
    The Sync client bundled with Mozilla products. It exists as a core JavaScript module providing generic functionality and UI components for each product.
    A server implementation of the Sync HTTP protocol. Clients communicate through it.
    Firefox Home
    An iOS application that functions as a Sync client.
    Mozilla Server Instance
    An instance of the server deployed and maintained by Mozilla. If you use Sync in your browser, this is what it talks to by default.


    There are numerous specifications concerning Sync. These include:

    • An HTTP API for client-server interaction
    • Storage formats used by the the clients
    • Cryptographic model for encrypting client data

    The definitive source for these specifications is

    Running a Server

    It is possible to run your own Sync Server instance. Full instructions are available at

    Getting Involved and Status

    For information on the current development status of Sync including how to get involved, see

    Document Tags and Contributors

    Contributors to this page: Sheppy, teoli, philikon, gps, muzuiget
    Last updated by: teoli,
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