For version 30.0.5.0 you could use libffmpeg.so from opera codec here: https://archive.archlinux.org/packages/o/opera-ffmpeg-codecs/opera-ffmpeg-codecs-88.0.4324.150-1-x86_64.pkg.tar.zst
If you have "no sound" problem when playing video or audio, you could try to run "flashpeak-slimjet" script with "--no-sandbox" flag.
If you have youtube high cpu usage problem because of sw.js service worker problem (you can check it with slimjet taskmanager), you could try to block service worker with "Reject Service Worker" extension.
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