There is a lot to love about Firefox lately (especially the last 20 or so releases) and 66 is no different.
Firefox version 66 includes support for Windows Hello for web authentication, allowing you to log in to websites that support the latest FIDO2 standards for passwordless logins.
Very cool and a feature that reminds me of using an Apple device.
And also, from Mozilla themselves:
Starting with version 66, Firefox will block audible autoplaying video and audio. This means media (audio and video) have to wait for user interaction before playing, unless the
mutedproperty is set on the associated HTMLMediaElement. Blocking can be disabled on a case-by-case basis in the site information overlay
If you haven’t tried Firefox lately on any of your devices I recommend giving it a try.