Close duplicate tabs wót Andy McKay

Finds and closes duplicate tabs by URL. Will assume that URLs in different contextual identities are not the same URL and will not be closed.

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Trjebaśo Firefox, aby toś to rozšyrjenje wužywał

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Finds and closes duplicate tabs by URL.

Z 4,1 wót 17 pógódnośujucych pógódnośony