Safari Facebook video no sound
I recently found that when using Safari to visit Facebook I could watch videos but there was no sound?
iMac, OS X Yosemite (10.10.4)
I solved it by placing the cursor over the video, placing two fingers on the trackpad and pressing.
A pop-up window appeared that allowed me to select the 'Unmute' option and the sound came on.
I have no idea why mute was applied to videos on Facebook but the problem is now solved.