FWIW Tab Center Redux (which may have been moved into Tab Center itself, the old, formerly-non-webext addon, not sure if that happened) is pure vertical tabs wi

FWIW Tab Center Redux (which may have been moved into Tab Center itself, the old, formerly-non-webext addon, not sure if that happened) is pure vertical tabs with no tree. I like it a lot. Most folks who use Tree Style Tabs use the tree extensively. I generally try to keep nesting to one level, sometimes two.