Bug 901801 - 897874 Followup: [Notification] horizontally scrollable with many CB messages
Merge pull request #11516 from leob2g/Bug_901801_897874_Followup_Notification_horizontally_scrollable_with_many_CB_messages

Bug 901801 - 897874 Followup: [Notification] horizontally scrollable with many CB messages, r=alive
Merge remote-tracking branch 'upstream/master'