Bug 932350 et al - Disable dom-level* test suite for intermittent failures on multiple platforms. a=test-only
Bug 957621 - Disable test_bug570378-* on b2g desktop for frequent failures which kill the run. a=test-only
Bug 850721 - Fix social blocklist oranges by not enabling the default update server. r=mixedpuppy, a=test-only
Bug 943275 - Correct test_conference.js. r=aknow, a=test-only
Bug 951028 - Fix NTFS permissions when a file is moved to a different directory. r=yoric, r=bbondy, a=sledru
Bug 965587 - Add lock to Firefox Health Report uploading. r=rnewman, a=lsblakk

Previously, it was technically possible for the FHR client to have
multiple simultaneous uploads. While this should never occur in
well-behaving systems, server logs have indicated that this behavior
might be occurring.

This patch adds a lock around uploading to ensure only 1 upload
operation may be active at a given time.

To measure the impact of this change in the wild, we added a counter
that increments whenever a held lock is encountered.