Go to Settings, and search for Autoplay (or in the left navigation, select Privacy and Security and scroll to Permissions).
Click the Settings button next to Autoplay, and set the default to whatever you like (amongst them "Block Audio").
Go to Settings, and search for Autoplay (or in the left navigation, select Privacy and Security and scroll to Permissions).
Click the Settings button next to Autoplay, and set the default to whatever you like (amongst them "Block Audio").