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Pógódnośenja za Tree Style Tab

Tree Style Tab wót Piro (piro_or)

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Pógódnośenja wót McG
wót McG, 8 éve
Tried to make the new version work with 57, but it doesn't. Reverted to 56.02 to resume using the old add-on, which does work.

Why is Mozilla killing off its add-on ecosystem?