The publisher of this extension is Matthew Johnson of Microsoft.
All credit goes to the author.
After installing this extension, Visual Studio's main menu will collapse when not in use (using the same behavior as Windows Explorer and Internet Explorer). To use the menu, simply press and release the Alt key, or press and release Alt+<shortcut> to directly show a menu (e.g. Alt+F to show the file menu). The menu bar will automatically hide again once you're finished using it.
My 2 cents
I just recompiled and updated the manifest to work with Visual Studio 2017 due to great demand.