Bug 829813 - Add more checks for dense element lookup results, r=billmm.
Bug 820491 - Part 1: Update download manager code to work with private downloads. r=wesj
Bug 820491 - Part 2: Fix DownloadManagerUI component. r=wesj
Bug 820491 - Part 3: Whitespace cleanup in aboutDownloads.js. r=wesj
Backout 66c886b7d927 (bug 827715),2c7287304555 (bug 829679) for bustage