How to have multiple Firefox tabs with audio playing have their input and output set to different virtual audio cable?

[L2L2L]

I believe I figured out how to work with a virtual cable. I have Firefox and OBS running, I can output the audio to OBS on a virtual line. With audio router it show different volumes and sound coming from different tabs. I like to route each individual sound coming from different tabs to a different virtual cable line. How would I go about this? It doesn't seem to work to just select and change the line.

[illtellyoulater]

I remember that for some time I used a Chrome extension for that. Something similar might be available for Firefox.