User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0 Build ID: 20150222232811 Steps to reproduce: Clicked on Firefox Hello icon and started a conversation . Sent link to my friend . Actual results: My friend was unable to hear any sound from my end , furthermore I was using a USB Headphone (mic built in) . Note: there was no video recording (webcam) device connected to my computer. Expected results: My friend should have hear my voice .

I have successfully reproduce the bug. I have also attached two screenshot of me and my friend.

There's a current limitation that if there is no camera installed (or available - some OS can't share the same device multiple times), then Firefox can't be used as the link generator. It can be used to receive links. We're working on this in bug 1106941.