User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36 Steps to reproduce: Update to V 43.1 (Latest update as of December 31 2015) (See below for details) Actual results: When users update to newest version, even with being logged into sync, add-ons, history, bookmarks, and other customized settings were erased or are missing. Expected results: Users who are logged into sync should have had all of their saved data to newest update, and should have not disappeared.

I don't know what's going on here, but it's not a general problem for all users. If you have specific steps that can reliably reproduce this, please reopen this bug and provide as much detail as possible. If you need help with a specific case or getting your data back, please visit support.mozilla.org for assistance.