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This page describes how to the client-side Sync API for sync engines (and their helper objects). The focus is on using this API to create a new sync engine to synchronize a new data type. The data type can be anything that extension JS code has access to through any Mozilla API; this means this page must of necessity be pretty vague about reading and writing the underlying data. You'll have to fill in those blanks yourself. Try browsing the [link] xpcom documentation to find out how to get at the many types of useful data that Mozilla stores.
To sync a new data type, you'll need to write an engine object that extends the base <tt>SyncEngine </tt> object; you'll also need to extend three helper objects. Here are the classes you need to extend, and the files in which they're defined:
# <tt>SyncEngine</tt>, <tt>Store</tt>, <tt>Tracker</tt> in <tt>services/sync/modules/engines.js</tt>
