The ability to have tabs in Finder is one of OS X Maverick's neat features. Here's how you can combine all open Finder windows into one tabbed window.
1. Go to one of your open Finder windows.
2. Go to the Window menu.
3. Select the "Merge All Windows" option.
All of your Finder windows will be combined into one tabbed window. This is a great way for cleaning up the Finder clutter that so many of us end up with on a day to day basis. It makes it much easier and faster to use the Finder in OS X Mavericks.
Read more: Cult of Mac