On the most recent release of the Safari web browser, Apple has disabled the auto-play of sounds and video, including the audible notifications for the Olark chat widget. You can fix this by following the steps below.
- In Safari, navigate to chat.olark.com.
- Open the Safari Preferences and then click on the websites tab.
- Click on “Auto-Play” in the General section.
- Change it from “Stop Media with Sound,” to “Allow all auto play.”
Here is a handy gif showing this process in action: