Windows 10 S, Microsoft's new locked-down operating system that comes bundled with the Surface Laptop, won't allow you to change the default Web browser away from Microsoft's own Edge. Furthermore, Edge's default search provider can't be altered: Bing is all you get.
Curiously you can download other browsers from the Windows Store, such as Opera Mini, but Windows 10 S won't let you set it as the default browser: if you try to open an HTML file, or click a link in another app, it will always open in Edge, according to Microsoft's official FAQ on the topic.
The FAQ uses very direct language: "Microsoft Edge is the default web browser on Microsoft 10 S. The default search provider in Microsoft Edge and Internet Explorer cannot be changed." It isn't clear if OEMs will be able to override this feature of Windows 10 S.