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Created attachment 741214 [details] All left sync error logs are attached for the fact they could be needed User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0 Build ID: 20130329030832 Steps to reproduce: Nothing conscious what could have caused the error. I noticed that the Firefox Sync feature had some problems the last days. I always got the message, that sync failed or the server is undergoing maintenance. Actual results: After these error messages appeared, on Monday (see error-logs attached) a lot of my bookmarks changed. In any seperate bookmark list, i. e. the bookmarks itself just as the ones in each created folder, some bookmarks from the top just jumped to the bottom of that list, on any synced device. I don't know if some of them even disappeared. Expected results: In fact nothing should have happened to the bookmarks. Except of maybe some newly added or deleted ones.