Thanks. I'd seen that thread months ago; it seems that the situation has improved a bit since then. As I was searching around, I also came across this: https:

Thanks. I'd seen that thread months ago; it seems that the situation has improved a bit since then. As I was searching around, I also came across this: https://addons.mozilla.org/en-US/firefox/addon/tree-tabs/ https://addons.mozilla.org/en-US/firefox/addon/tree-tabs/ ...which looks to have similar functionality, and is already WE compatible.