Youtube works fine. Twitch and Facebook won’t play video at all.
I assume this is classic codec bullshit, but don’t know what to do about it.
EDIT: OpenH264 :: Fedora Docs
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Hello! I am using fedora 40 and have the same problem with firefox. Is a codec problem (h264 codec is missing and for this reason youtube can´t play videos in firefox). In the console (konsole app) you have to write the next command:
sudo dnf install gstreamer1-plugin-openh264 mozilla-openh264
then restart firefox and problem solved.