When the final version is released, Firefox Sync 1.3 will include Firefox Mobile (Fennec) support, the ability to synchronize more Firefox preferences, bookmark backup that initiates before the first sync to prevent data loss, and major interface and performance improvements. Account creation should be easier, with a revamped "wizard," and the changelog for the beta indicates that many of the pre-existing features will simply work better.

There's one other interesting modification: This version will introduce a new JavaScript-based crypto wrapper, which Mozilla says will enable experimental syncing for Mac 64-bit and Linux PPC desktop computers, as well as several mobile devices, including Android phones and the Palm Pre.