My Macbook air has just started to have a new tab pop up whenever im using the internet That has a dunny URL and when i click on it is has something about encrypted connection when i click the bit about certificates it shoes me they are valid but
Keeps doing this every 30 seconds or so. I have to cancel out of the tab and back to what i was doing and then it happens again and again every 30 seconds. I actually have no idea what it is or what to do to fix this