Mac: When Mavericks was released, we finally got tabbed browsing in Finder. It's great, but things can get a little out of control if you open too many tabs. iDownloadBlog point to a menu item you might not have noticed before that allows you to instantly merge or split those tab windows.
When you're looking at Finder, just click Window > Merge All Windows to merge all your open Finder windows together, or Window > Move Tab to New Window to pull a tab out into its own window. It's simple, but handy for those moments when you've accidentally found yourself with a cluttered screen.
How to split and merge Finder windows on the Mac [iDownloadBlog]