You may encounter that your preinstalled Firefox, or the Fedora Flatpak one (no
fix currently afaik), can’t play videos. This is due to missing nonfree codecs,
that the Fedora Project would need to pay an enormous amount of money for, thus
they can’t possibly preinstall it. There is rpmfusion [rpmfusion.org] though,
which is not situated in the US and thereby can easily ship these packages
without consequences. Also, some Flatpak apps or runtimes ship ffmpeg, which
includes the wanted video codecs. Here are some ways to fix this problem. I will
focus on Fedora Atomic versions, but on regular Fedora its similar. (Something
UTF-8 in Lemmy is severely broken, please use the link)