Holy simplicity!

I love it! Works as advertised. Makes it clear that you're in a private window. Beautiful purple shades as well :)

Good idea but it also changed the tab colours, address bar colours and menu colours in non-private window.

Was great when published, but some colours in non-private windows get changed as well (set to black in a light theme). Presumably due to some changes in Firefox after the add-on was last updated.

Works perfectly!

Fajnie pasuje do trybu prywatnego.
Można by trochę zaokrąglić pasek adresu.

Excelente. Uno de los problemas de Firefox es que no se distinguen bien las ventanas privadas de las normales. Pero luce un poco raro.