如题在测试两种centos后续系统时，发现firefox无法播放HTML视频问题。经过一番折腾找到了解决的办法，具体解决如下：
首先下载VLC
$sudo yum install vlc
而后重启浏览器就可以使用firefox播放HTML视频了。
在下载vlc时会因为仓库问题出错，
对于Rocky，这里直接使用中科大的源一劳永逸，根据自己的系统使用对应的命令。
中科大源官网
Rocky Linux 源使用帮助 — USTC Mirror Help 文档
#我使用的时rocky9，所以使用如下命令
sed -e 's|^mirrorlist=|#mirrorlist=|g' \
-e 's|^#baseurl=http://dl.rockylinux.org/$contentdir|baseurl=https://mirrors.ustc.edu.cn/rocky|g' \
-i.bak \
/etc/yum.repos.d/rocky-extras.repo \
/etc/yum.repos.d/rocky.repo
#更新缓存
dnf makecache
对于centos stream 9，使用RPM Fusion源。
RPM Fusion源官网
Configuration - RPM Fusion
先找到Command Line Setup using rpm目录，而后复制RHEL or compatible like CentOS下的命令到命令框执行。
#下面命令即为上述欲复制命令
sudo dnf install --nogpgcheck https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E %rhel).noarch.rpm
sudo dnf install --nogpgcheck https://mirrors.rpmfusion.org/free/el/rpmfusion-free-release-$(rpm -E %rhel).noarch.rpm https://mirrors.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-$(rpm -E %rhel).noarch.rpm
#更新缓存
dnf makecache
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