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On some new installs of Linux, the Webex Web App is unable to receive video from other attendees when using Firefox. This is likely caused by missing libraries not installed on the Linux machine.

Follow the instructions below for your specific Linux distribution to resolve this issue.

Ubuntu

1. Open the Terminal application on Ubuntu.
2. Run the following commands in order. When prompted, enter your password, and then follow the instructions in the Terminal to complete the installation procedure:
   • sudo apt-get update
   • sudo apt-get install ubuntu-restricted-extras
3. Restart Firefox.
4. Click on the menu icon   in the upper-right corner of the browser window.
5. Click Add-ons.
6. Click Plugins in the left panel.
7. Find Open H264 Video Codec provided by Cisco Systems, Inc. and make sure it is installed, enabled, and always activated:

1. Open the Terminal application on Fedora.
2. Run the following commands in order. When prompted, enter your password, and then follow the instructions in the Terminal to complete the installation procedure:
   • sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
   • sudo dnf install ffmpeg-libs
   • sudo dnf config-manager --set-enabled fedora-cisco-openh264
   • sudo dnf install gstreamer1-plugin-openh264 mozilla-openh264
3. Restart Fedora.
4. Open Firefox.
5. Click on the menu icon   in the upper-right corner of the browser window.
6. Click Add-ons.
7. Click Plugins in the left panel.
8. Find Open H264 Video Codec provided by Cisco Systems, Inc. and make sure it is installed, enabled, and always activated:

1. Open the Terminal application on CentOS / RHEL.
2. Run the following commands in order. When prompted, enter your password, and follow the instructions in the Terminal to complete the installation procedure:
   • For CentOS / RHEL 7:
     • sudo yum install epel-release
     • sudo yum config-manager --set-enabled PowerTools
     • sudo yum localinstall --nogpgcheck
       • https://download1.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm
       • https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-7.noarch.rpm
     • sudo yum install ffmpeg
   • For CentOS / RHEL 8:
     • sudo yum install epel-release
     • sudo yum config-manager --set-enabled powertools
     • sudo yum localinstall --nogpgcheck
       • https://download1.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm
       • https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm
     • sudo yum install ffmpeg

3. Restart CentOS / RHEL.
4. Open Firefox.
5. Click on the menu icon in the upper-right corner of the browser window.
6. Click Add-ons.
7. Click Plugins in the left panel.
8. Find Open H264 Video Codec provided by Cisco Systems, Inc. and make sure it is installed, enabled, and always activated: