It's another shitty new trend in webdesign activating browser popups where you can allow or block notifications, they come back every time when you go to these websites and with every page you open, this shit has to stop. In Config there is a list of notification related settings but no idea which one to set to False?

update, the 3rd search was more successful and the config solution is: dom.webnotifications.enabled

 

this shit is called web notifications.

 

quality article here http://www.skipser.com/p/2/p/stop-firefox-push-notifications.html