Hello, I have an audio problem with FF. Version is 60.0.1 , 64bit. Setup Win 7x64, xonar dgx sound card. This is a recent issue, from 60.0 I think. On some youtube/twitter videos I only get sound in the left speaker if I select the 6 channel option. The selected output is headphones, but the card allows me to select from 2 to 8 input channels (which I use for 5.1/7.1 sources with dolby headphone (virtualization). If I select the 2 channel option then it works fine. I have tried it both with IE 11 and Opera and the sound is fine when 6 channel is selected. I have tried disabling all the addons, same issue. Below are 2 links of videos in which the problem manifests itself (the subject of the videos is not relevant, they are just an example): https://www.youtube.com/watch?v=o9HdFgmsNos https://twitter.com/taylorswift13/status/969342733088444417 2 links of videos that work fine with 6 channel enabled: https://www.youtube.com/watch?v=hTvJoYnpeRQ https://twitter.com/taylorswift13/status/905811133210210310 Thanks.