Ummy Video Downloader - Not Working - Remains at 0%

Example Below. Never proceeds to actually downloading. How can I make it work?

Browser: Chrome 84.0.4147 Mac OS X

User Agent: Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 84.0.4147.125 Safari / 537.36

Extension: userjs-chrome 9.6.2