I can only get transferring of tabs from one window to another happen if the BOTH windows have tabs already. I cannot get it to take 2 individual windows and combine them into a single window with 2 tabs. Also, if you have 2 windows, each with 3 tabs, and you want to make a single window with 6 tabs, you cannot do that. The best you can hope for is 2 windows: 1 with 5 tabs and 1 with one tab, because you will never be able to transfer that last tabless window into the window with 5 tabs. (unless I am doing something wrong--anyone?)

:(

But still pretty cool.

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try the Window menu
go down to "Merge All Windows"

It took me a while to find it too!

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You can.

Just grab the single tab in the window and drag. The window goes translucent and you can dock it into another window.

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