Aby toś te dodanki wužywał, musyśo Firefox ześěgnuś.

Pśizjawiś
Dodankowy symbol

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Undo Close Tab wót Manuel Reimer

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Wótegrono wót Manuel Reimer

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jo se napisał pred 2 letoma
That could be a hard one as Mozilla really makes it difficult to integrate with the existing themes.
But I maybe found something that is worth trying. Can you create a GitHub issue for this?