Backport Bug 1528955 - Tab successfully pinned notification
Backport Bug 1528955 - Tab successfully pinned notification

rlr/activity-streams,mozilla/activity-stream,Mardak/activity-stream,mozilla/activity-streams,rlr/activity-streams,rlr/activity-streams,mozilla/activity-stream,Mardak/activity-stream,mozilla/activity-stream,rlr/activity-streams,Mardak/activity-stream,Mardak/activity-stream,mozilla/activity-streams,mozilla/activity-stream