Facebook video won't play sound in Safari on MacBook Pro
Recently Facebook video stopped playing audio in Safari on MacBook Pro 2017 Touchbar running OSX 10.12.6. All other video sites work fine and Facebook videos play with audio in other browsers. Have tried rebooting, checked the sound settings in FB video player. Any suggestions appreciated, thanks!
MacBook Pro with Retina display, macOS Sierra (10.12.4)