Unable to play videos on KDE web page

English Applications
#1

This is puzzling me. I have codecs installed via opi codecs and I can watch anything I want with firefox (including netflix, TV media centers)…
…except the Plasma 5.25 demo videos at
https://kde.org/announcements/plasma/5/5.25.0/

Whenever I click on a video, the controls show me that the video got started (by displaying the pause button), but that’s all.

If I inspect the videos, I can see two different versions behind:
https://cdn.kde.org/promo/Announcements/Plasma/5.25/Videos/Highlights_Gestures_FINAL_720p.webm
and
https://cdn.kde.org/promo/Announcements/Plasma/5.25/Videos/Highlights_Gestures_FINAL_720p.mp4

If I copy these URLs and paste them into a new tab, the videos play without any issues.

Is there anything else I need to do to play these videos?

#2

Same here, FF102.0.1 - Leap 15.3.
Seems to be a cookie issue. Try allowing cookies for the session in page info “ctrl+i”. Worked for me. Blocking them and reloading with ctrl+F5 reproduces the issue.

#3

That happens here, too. But they play in konqueror.