According to a post on the Windows Insider Blog, Build 25136 is testing a File Explorer browser with tabs, allowing you to hop back and forth between folders without opening a new window. However, even if you are a Windows Insider and have your PC set to receive Dev Channel builds (for users who want to receive the most active updates, even if they may be unstable), you may not notice the test straight immediately. The enhancements are being rolled out, as senior program manager Brandon LeBlanc stated in a tweet. Apparently, they will wait for comments before allowing more testers to participate.
