geht plötzlich nicht mehr!

3.7.3 is broken - no more working. No reaction left mouse on Tabs. I went back to 3.7.2 - perfectly working.

It's really a useless add-on. It doesn't reduce the tabs at all.

Does not reduce the number of tabs as advertised, instead it opens a side panel which is not what I was looking for.

Why did you remove the Vertigo theme? It was literally the best theme you had. Please add it back!

This has all the potential of being a great extension. Unfortunately, after bookmarking a carefully structured set of trees, on reloading them, the tree structure is completely scrambled, resulting in lots of wasted time having to rearrange it all over again. More of a hindrance than a help, in the end.

While trying to rearrange several nested tabs, it suddendly began to close all of them. The tabs have disappeared and I can't recover them. I have tried "Restore recently closed tab" but it only restores tabs that I have closed. The tabs that this add on closed without any reason are gone.

Constant freezes that force you to restart the browser. Most useful addon, most horrible implementation.

This add-on does not work. I get a top tab, but can't view the tabs within the tree.

Since last FF update to 74.0 (64 bit) this extension stopped working. After de and re-installing it worked again, BUT the keayboard shortcuts are absent (most important: F1).
I can't see any workaround.

Great add-on, but latest update is broken for me. Clicking on tabs does not switch the active tab. I have to use Ctrl+Tab to switch tabs.

Laggy, bloated, too many useless features. Freezes every second for no reason.

It froze my Firefox! I had to force quit.