This is a very good addon, but there is a missing thing which is the following:
I do not want the appearance of the hierarchy between the tabs to be in the left side neither the right side

I want the hierarchy to appear in the top side, I mean in the original tab bar of Firefox, I mean like what was in the old versions, before converting the addon to the type of web extension
I mean
like what Piro have written in his website about this addon that this addon Shows the tab bar as a tree of tabs.

but I do not find this option in the preferences like before

I hope Piro (piro_or) update the addon with this feature