Is it possible to change the volume level of a browser tab independently?Updated 9 months ago

In short, no.

BEACN Mix grabs the entire application or program offered to it by Windows, so there's no way to separate various tab audio into separate "programs". If there is an extension or other program available that would help Windows "see" each tab as a separate program, you could theoretically put those programs on different knobs, but we haven't found a way to do it reliably yet.