Version: 70.0.3532.8
Reproduction Steps: 
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2. Notifications from messenger.com and Hangouts Chat keep repeating all the time every 3-4 seconds and interrupt everything I am trying to do. FOr instance, when I am unlocking the computer, I keep hearing these notifications. They won't even let me get to the messenger.com or Hangouts Chat to shut them up. I keep trying to Alt+Tab to the Messenger or Hangouts Chat but I can't easily get to it as the interruptions are constant.