Lately I've been getting an annoying pop up most times when I click a thread asking me if I want to "leave page" or "stay on page". I mostly use Safari on my MacBook, any ideas what's causing this? It's driving me mad, the extra step is a pain in the butt.

I tried Google Chrome and it doesn't happen there, but I'm used to Safari and hate change. Any help would be appreciated, thanks?

 

Here I am
on the road again. ..
up on the stage..

 

Thank you?