Unfortunately, your browser does not support video playback.

[VMC]

I get this error on videos on Ubuntu only. Xubuntu & Kubuntu , which has the exact same Firefox version, has no problem running the videos. I use msn.com videos section for example.

I thought it might be Flash, but the others don't need it. I installed it anyway. No difference.

apt show firefox

was identical on all three versions.

[Frogs Hair]

Is it DRM content ?

[VMC]

Play DRM-controlled content is checked on all three distros.

[Frogs Hair]

I just tested on U Budgie development release and the videos play just fine. ???

[corradoventu]

I have no problems playing msn.com video on my Ubuntu 20.04 with firefox

corrado@corrado-x5-ff-0309:~$ apt policy firefox
firefox:
  Installed: 74.0+build3-0ubuntu1
  Candidate: 74.0+build3-0ubuntu1
  Version table:
 *** 74.0+build3-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
corrado@corrado-x5-ff-0309:~$

[VMC]

I dont need mines fine comments, i'm looking for ideas. I have the latest iso installed. same error as yesterdays. x, k ubuntu works. ubuntu doesn't

[VMC]

I just tested "prefs.js" form both ubuntu and xubuntu line 12 was the only difference so far. I'm going to try and cmp "about:config" on both. See if I can find something different. Also ubuntu iso fails on flash using firefox.

[Frogs Hair]

Have you tried a new profile ?

[VMC]

Have you tried a new profile ?

The thing is, even using the flash ISO and not installing it fails. I just installed Manjaro gnome and it also works flawlessly. Checking all settings. Can't find anything relative to firefox.

[Frogs Hair]

What is listed in extensions> plugins ?