Created attachment 8880933 [details] firefox.zip User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0 Build ID: 20170608105825 Steps to reproduce: I went to select one of my Bookmarks from a folder on the Bookmarks Toolbar. Actual results: All of my Bookmarks in the folder have been re-arranged. I now see two of the same named folders on the Toolbar. Expected results: I should have seen the same Bookmarks and order as they were yesterday. This also happened ~9 months ago. The attachment is the sync error log, last backup.json, newly backup .json.
When I went to restore my last known good .json file I found automatically saved backup points in the restore pull-right menu. From the size of these I can see the last good one is June 15 and the first doubled in size one is June 19.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
P1 (data corruption that effects all clients).
Priority: P3 → P1
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