I have Avast on two computers. They both regularly inform me that they have discovered an infection when I access YouTube.
On one computer, there is a button to add an exception. Clicking that gets rid of the alerts for a while. On the other computer, there is no button to add an exception. I guess I could dig down into the program on the second computer to add an exception every time this occurs, but I would rather have a button similar to the one on the first computer