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Feature request :
Use a different tab color for a Private Tabs, so we can tell wich tab is Private without activate that tab and see the private icon in the menu bar.

Это отзыв для предыдущей версии этого дополнения (0.1.3.1-signed). 

Private tabs should be underlined:
https://addons.cdn.mozilla.net/img/uploads/previews/full/93/93831.png
(this is used for compatibility purposes to support most themes and extensions)

And you can try to change tabs appearance using following styles:
https://github.com/Infocatcher/Private_Tab#styles