30p87, 6 months ago Probably not that useful for OP, as they want an extension, but: On Linux one could use pavucontrol to individually set volume (in and out) and devices for every single stream, including single tabs.
Probably not that useful for OP, as they want an extension, but: On Linux one could use pavucontrol to individually set volume (in and out) and devices for every single stream, including single tabs.