Hi, I noticed a problem on my MacBook Pro when Firefox is running. When I have 4 tabs opened on a precise streaming website, with the sound '''disabled''' on these 4 tabs, and I run other tab (like youtube) or other app (VLC, Music,...) with the sound enabled on it, I can ear some "pop" or "crackle" in the speakers. I performed the same test with Safari and the problem don't appear. Motherbaord, and speakers have been replace on my laptop by AppleCare. I think it's a software issue (maybe due to Firefox, maybe to macOs). I contacted Apple to explain my problem and ask them try to reproduce the issue, but they won't do until Mozilla confirm that the issue is not due to Firefox... I did't find how to contact Firefox support Team, so I posted here... Regards, Joe