An essential extension if you have about 200 tabs open, like me :-)
Thank you so much for your hard work!

you have the best wiki for tree tabs

tabhideにもいち早く対応し、グループのスイッチができる数少ない縦型タブアドオンだと思います。
せっかくtabhideに対応しているので、タブのコンテキストメニューに「Simple Tab Groups」のグループ移動のメニューが出てほしいと思いました。
上部のタブバーを隠すと他のアドオンのコンテキストメニューが開かないので、タブグループの移動ができないのです。

Awesome!

perfect!

Just amazingly useful!

Love the grouping feature and that I can close individual tabs with their own [x] button without having to first navigate to them.

Some ideas:
- Visually maybe it would be best to show each tab's [x] button on hover though
- Should be able to drag left to ungroup (unindent) one level and drag right to group under the previous (above) item
- Also, it would be really if a filter box was on the top to select which tabs to show (filter titles using typed substring). Indentations should be remembered (that is have invisible parents if those are filtered out). If hard to implement, it could at least highlight found items or gray out items not found. Could also have that as option and could have Previous/Next button to select next tab that matches the filter

Been using this add-on for ages, keep up the amazing work!

Makes your tabs more like a folder list. You can collapse individual branches of the tree and really see a whole lot of tab roots all at once. This is the way all tabs should be done in every browser!

シンプルで使いやすいです

Number 1 add-on of any add-on that has ever existed:
A+ | 10/10 |

Must have. Cannot use a browser without it. No other add-on has the same feature. Thanks a lot!

The reason why I am still using firefox and love it very much. This is must have addon, that makes life easier and more organized.

作ってみてわかったけど、
かなり細かいところまで、お手製で作りこまれている。すごい。

Great extension!
The only thing that could be improved is a default smaller tab height like before the WebExtensions version. But it can be changed with a code snippet found on the extension wiki.

Came to it as a replacement for Tab Groups when Firefox Quantum stopped supporting that one. Was great while it worked, but now it just shows the loading icon forever; both on Linux and Windows. EDIT: After update works perfectly again