Ok. So Im on Arch Linux. Tried downgrading 78, works correctly. I have firefox dev edition ver 80 and the left channel is about 64x quiter than right. Does any one have similar problem or knows how to fix it? Firefox problem - confirmed (ALSA, pulse with or without jack aren't the problem there) It's not a preference, setting, addon - confirmed. (started browser with brand new browser profile) Isn't update problem - disconfirmed (It did break after update. Downgrading and faking profile(browser version) worked fine.) any help, or even a way to find what and where it is caused would be helpful. I did look into a shit ton of setting and debug menus, to find that everything is in norm. (pls ignore these extensions, i will do cleanup soon and they aren't a problem here anyways)