I guess there are console options, where you can set HTML5 now.

Check on the small “arrow” next to the console icon.

From: Jayme <jaymef@gmail.com>
Sent: jeudi 2 août 2018 01:02
To: users <users@ovirt.org>
Subject: [ovirt-users] Possible to use Console via Mac web browser?

I recall in the past (on a bit older of an oVirt build) I was able to launch VM consoles from my web browser.  I believe it may have been using spice html5 at the time, is this still possible?  Currently launching console downloads the typical .vv file. 

What is currently the best/easiest method to access VM consoles using MacOS?