I just received this error message after clicking on a link in an email from Congresswoman Tulsi Gabbard:
Your browser does not currently recognize any of the video formats available. 
Click here to visit our frequently asked questions about HTML5 video.
Copy/Paste produced the above solid black line instead of the three lines of text I had highlighted.
Hope this helps,Bob James
    On Thursday, June 27, 2019, 4:30:47 AM EDT, Olivier Tilloy <email address hidden> wrote:  
 
 Just tested in an up-to-date 18.04 virtual machine, and I can play the
sample videos on gaia.com's home page.

What exactly is not working? Streaming videos maybe? Can you share the
exact error message that you get?

Also, please run the following command in a terminal to attach
additional information to the bug report:

    apport-collect 1834375

Thanks!

** Changed in: firefox (Ubuntu)
      Status: New => Incomplete

-- 
You received this bug notification because you are subscribed to the bug
report.
https://bugs.launchpad.net/bugs/1834375

Title:
  Gaia.com videos unsupported

Status in firefox package in Ubuntu:
  Incomplete

Bug description:
  Firefox could not play videos on Gaia.com.  The error message blamed
  the browser.  So I downloaded and installed the browser Opera, with
  the same results and message.  Both browsers would play Youtube
  videos.

  Please enable Gaia.com videos.

  Thanks.

  I downloaded the latest Ubuntu release today.  18.04...something

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 4.15.0-52.56-generic 4.15.18
  Uname: Linux 4.15.0-52-generic x86_64
  .tmp.unity_support_test.0:
  
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Wed Jun 26 17:57:24 2019
  DistUpgraded: 2019-06-26 11:14:51,559 DEBUG icon theme changed, re-reading
  DistroCodename: bionic
  DistroVariant: ubuntu
  GraphicsCard:
  Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e12] (rev 03) (prog-if 00 [VGA controller])
    Subsystem: Hewlett-Packard Company 4 Series Chipset Integrated Graphics Controller [103c:3048]
    Subsystem: Hewlett-Packard Company 4 Series Chipset Integrated Graphics Controller [103c:3048]
  InstallationDate: Installed on 2019-06-25 (1 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-52-generic root=UUID=dfa2862a-4da8-414d-9f41-cecde30f67c6 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  UpgradeStatus: Upgraded to bionic on 2019-06-26 (0 days ago)
  dmi.bios.date: 06/23/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786G2 v02.02
  dmi.board.name: 3048h
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.type: 4
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr786G2v02.02:bd06/23/2011:svnHewlett-Packard:pn:pvr:rvnHewlett-Packard:rn3048h:rvr:cvnHewlett-Packard:ct4:cvr:
  dmi.product.family: 103C_53307F
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
  version.libdrm2: libdrm2 2.4.95-1~18.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.8-0ubuntu0~18.04.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.8-0ubuntu0~18.04.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
  xserver.bootTime: Wed Jun 26 10:11:57 2019
  xserver.configfile: default
  xserver.errors:
  
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.6-1ubuntu4.1~16.04.2
  xserver.video_driver: modeset

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1834375/+subscriptions