Another Tab Groups user here. Between Tab Groups and Tab Mix Plus for a multi-line tab bar I have to seriously redesign my workflow. I could live with Tree St

Another Tab Groups user here. Between Tab Groups and Tab Mix Plus for a multi-line tab bar I have to seriously redesign my workflow. I could live with Tree Style Tab if it could nest tabs on the horizontal tab bar. I run FF on a portrait 1200x1920 screen and the vertical sidebar takes up too much space.