My comments in Portuguese and English:

Justamente por ser "Simple" Tab Groups, é prático para usuários comuns que precisam de praticidade para organizar numerosas abas abertas. Você cria grupos e os identifica como achar melhor, e em seguida arrasta para dentro de cada grupo as abas abertas, de acordo com os assuntos.

Por outro lado, uma grande desvantagem desse complemento é que ele força você a ocultar as guias agrupadas.
No agrupamento de guias do Chrome, seu grupo aparece como uma única guia que pode ser facilmente expandida e recolhida quando você deseja mostrar/ocultar todas as guias pertencentes a este grupo.

Precisely because it is "Simple", it's practical for common users who needs practicality to organize numerous open tabs. You create groups and identify them how to find better, and then drag into each group the open tabs according to the subjects.

However, a major drawback of this addon is that it forces you to hide the tabs that are grouped. In Chrome's guide grouping, your group appears as a single guide that can be easily expanded and collected when you want to show/hide all guides belonging to this group.

Private mode is NOT SUPPORTED. What a bummer!

this is very good, but my only complaint is that I have to re-sign into everything in the tab groups

A must-have for Firefox users!

The absolute worst thing happened to me! I tried to open an old tab in a group I that's never been opened for months, I checked Task Manager and Firefox went from 5gb memory usage to over 20gb and it just kept increasing until my PC stops responding. This memory bs happened everytime I try to open Firefox, so I had to uninstall Firefox and lost everything.

Nothing 'simple' about this add-on. Confusing and over-engineered. Name change is needed...;)