We are continuing to return the habitual AVD look in new AVD 3.0.
You still can install old AVD version in Firefox 56 and below here: https://addons.mozilla.org/en-US/firefox/addon/video-downloader-player/versions/
In case of problem with new nwe AVD 3.0 please contact with details to our support at https://support.ant.com/hc/en-us/requests/new