If you get a warning like this be very careful about clicking ‘Allow.’ I’ve noticed that lots of websites have been asking to send me notifications. What you may not realise is that these notifications do not come through your web browser. They come through the OSX built-in notifications that appear on the right of your screen. This means that the notifications can appear when you’re working in a word processor, typing an email, anytime! What’s worse is when a notification pops up there is no simple way to turn it off. You can dismiss it as read, but you can be sure you will get another notification from that same website pretty soon. I personally find this quite intrusive and it gets very annoying.
To turn off notifications from websites you need to go into your ‘System Preferences’ and then click on the notifications tab, then scroll down to the website that has given you the notification, and delete it. There will be an entry in the notifications settings for any time you have clicked ‘Allow’ – you need to go and delete them all one by one. It’s quite a process!