Firefox does not play videos

I try opensuse tumbleweed but is not userfriendly to install videocodecs.
If i add a repo packman then i choose to install vlc and after that i get errors with dependencies.>:)
Also epiphany does not play any video.
On debian i can watch videos with firefox and epihany.Not with opensuse.Its a mess with dependencies errors if i install videocodecs or installing vlc when add pacman repo.
There a two vlc .One is vlc and the other vlc-beta.installing vlc-beta or vlc-codecs does not install because dependencies are not correct.very confusing .
Opensuse is a mess with dependencies errors and i cannot play any video from youtube or anything else.
Why is there are no easy installer for installing codecs?

You must do the vendor change to Packman.

One of the sticky threads at the top of this very Multi-media sub-forums: Multimedia Guide for openSUSE Tumbleweed - Multimedia - openSUSE Forums

IMHO you can skip until:

When done. Close the terminal. And open Yast > Software Management and Apply the Package Switcher on Packman.

Gnome: SUSE Paste

If you encounter dependency errors: You need to accept changes that allow vendor switch to Packman If you can’t work it out. Ask in the forum.

The below site and Packman fixed my issue.

Operating System: openSUSE Tumbleweed 20201002
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
Kernel Version: 5.8.10-1-default
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4810MQ CPU @ 2.80GHz
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600