(http://i58.tinypic.com/ofzh93.jpg)
Microsoft today released Windows 10 Build 10166 to Windows Insiders. This new Windows 10 build includes new Microsoft Edge browser build. In this new Microsoft Edge build, localhost support us now re-enabled by default.
New:
► localhost loopback is now enabled by default. You can toggle localhost by navigating to about:flags.
► Bug fixes
Known Issues:
Microsoft Edge has a new app ID that will cause any favorites, cookies, history and Reading list items that you had saved in “Project Spartan” from previous builds to be lost after upgrading. If you want to keep these, make sure you back up your favorites before upgrading to Build 10166. To save your favorites, follow these steps before upgrading:
1. Copy your favorites from %localappdata%/Packages/Microsoft.Windows.Spartan_cw5n1h2txyewy/AC/Spartan/User/Default/Favorites
2. Save them to %userprofile%/Favorites.
3. After upgrading to the next build open Microsoft Edge, choose Settings, and you’ll see an option to import favorites from another browser. Choose Internet Explorer to import the favorites you saved in your %userprofile% directory into Microsoft Edge.
When using a Windows locale setting other than en-US, users may have difficulty accessing about:flags. To workaround this issue, temporarily change your locale to en-US and set your desired flags. Your flags will be preserved even if you change your locale again afterward.
source:microsoft-news