Iv’e tried installing all the codecs with epel and rpm fusion and still have no sound on firefox esr videos?
I’m using the kde version
Can you provide an example video? I have no problems with video playback on firefox.
It was video from this website
That one is playing fine here. Sorry, I cannot reproduce your problem.
I tried this with these errors? I still have no sound from any firefox videos. And they stopped playing on the above website now.
Never mind I’m going to RHEL-it works 
manny@localhost-live ~]$ sudo dnf install ffmpeg
Last metadata expiration check: 0:02:52 ago on Mon 10 Feb 2025 03:05:54 PM EST.
Error:
Problem: problem with installed package libswscale-free-5.1.4-3.el9.x86_64
- package ffmpeg-libs-5.1.6-2.el9.x86_64 from rpmfusion-free-updates conflicts with libswscale-free provided by libswscale-free-5.1.4-3.el9.x86_64 from @System
- package ffmpeg-libs-5.1.6-2.el9.x86_64 from rpmfusion-free-updates conflicts with libswscale-free provided by libswscale-free-5.1.4-3.el9.x86_64 from epel
- package ffmpeg-5.1.6-2.el9.x86_64 from rpmfusion-free-updates requires ffmpeg-libs(x86-64) = 5.1.6-2.el9, but none of the providers can be installed
- conflicting requests
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
If you want to install ffmpeg (from the third-party rpmfusion repository), you have to use --allowerasing to uninstall the epel packages.