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    This is real solution !!!!!!!
    – user956584
    Commented Jan 7, 2017 at 20:36
  • 4
    Still works in FF v52. So silly that they don't have a setting about it in the normal preferences. Oh well, the web is going south....
    – Davide
    Commented Apr 11, 2017 at 16:04
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    This seems to be the only working solution by now! I've seen elsewhere lots of references to a "Preferences - Contents Windows - Notifications - Do not disturb" button, which seems to not exist anymore, at least in FF 55. It's been very annoying having most websites I visit requiring all my attention to first choose to enable or not notifications, one by one. Commented Sep 13, 2017 at 14:55
  • also works in firefox 57 quantum Commented Nov 22, 2017 at 15:21