Recently, we reported that Google Chrome might be getting support for Windows 10 mixed reality, and now the feature is generally available for those who wish to try the by downloaded the latest build of Chrome Canary, at version 74 (spotted by Windows Latest). Additionally, you'll also need to be participating in the Windows Insider program and to be running build 18329 or later of Windows 10, as support for win32 apps is still in beta.
If you have both things up and running and you have your own headset, all you need to do is to copy
chrome://flags/#windows-mixed-reality into your address bar and hit enter, then enable the flag highlighted in yellow. This will allow Chrome to "use support for Windows Mixed Reality devices for VR" according to the flag's description.
The new feature is likely part of Microsoft's recent contributions to the Chromium project, as the company plans to bring Chrome's Blink engine over to Edge for better web interoperability. This also means that when Edge does indeed become Chromium-based, it will retain its support for Windows Mixed Reality.
Right now, there's still no word as to when the feature will come to the stable version of Chrome, but general Windows 10 users will need to wait at least until the next major release of the operating system, which is due for later this spring. In the meantime, Chrome Canary and new Windows Insider builds are the best way to try it early if you don't mind dealing with bugs.