The behavior is very similar to how just about every modern web browser works, allowing you to merge and gather single windows into a unified window for easier browsing and less clutter. You can always add new Finder tabs to this window (or any other) by hitting Command+T or by pressing the little plus button in the tabbed window too. This instantly retrieves every single open Finder window, regardless of their folder path, into a single tabbed Finder window view.

With multiple Finder windows open, pull down the “Window” menu and select “Merge All Windows”.

How to Merge All Finder Windows into Tabs on Mac Used properly, Finder Tabs will prevent the enormous amounts of window clutter that can occur unintentionally when navigating around the Mac file system and juggling a handful of different windows and locations, but if you find yourself overwhelmed with Finder window overload you can use the excellent Merge feature to gather all windows into a single Finder window with tabs. Finder Tabs are one of the better Mavericks improvements brought to the Mac OS X Finder in years, letting you use the file system in a single window view, with each open folder or directory path as it’s own unique tab.

How to merge all windows in chrome