Whenever someone writes me a message on hangouts or messenger, I get this popup:
How can I disable this? It's very annoying when I'm watching a movie
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The simplest way would be to just turn off all notifications for the applications.
You need to swipe down your notification bar and then long press on each notification, it should open up a menu for disabling all notifications, if this doesn't work then you'll need to open up the applications individually and thoroughly go through the settings of each app, most likely you'll have an option to turn these type of notifications off.