To use the WebUSB feature some prerequisists must be fullfilled

• Technically WebUSB is an open standard. But only Chrome implements this specification at the moment, so end-users may need to switch browser to use this feature.
• Because this API is a powerful new feature added to the Web, Chrome aims to make it available only to secure contexts. This means you'll need to use HTTPS if you run brainbox on your own raspberry or desktop computer.
• During development you'll be able to interact with WebUSB through http://localhost/...