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wót sashabe dnja Awg. 19, 2016 · trajny wótkaz

It works, but the tabs in all the windows but first one get reloaded upon merging, thus losing any text input or saved data in there.
Also, a nicer place for Merge windows command would be in Window menu.
At last, a nice to have functionality would be to add Duplicate to Private Window — this is often useful for debugging websites.