Microsoft calls for testing Chromium open source project in the development of Microsoft Edge

Microsoft is changing the Edge browser’s rendering engine from EdgeHTML to Google Chromium, which is expected to bring a variety of benefits, including improved compatibility with the site, more developer-friendly, and support for Google’s Chrome extension. However, replacing the engine requires a lot of testing, so Microsoft is now opening for registering.
Microsoft Edge
Fortunately, this seems to be independent of the Windows Insider program, which means you can test your browser independently without having to upgrade your PC to the Windows 10 Insider Previews.
There is news that Windows 7, 8.1 and macOS are expected to be supported in addition to Windows 10. The interested user can sign up here.