How to get Twitter gifs and short videos working on Firefox on Fedora
Note: This is for Fedora 28, however the process should be similar for other recent Fedora versions as well.
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Go to https://www.youtube.com/html5 and check if all boxes are checked. If gifs or short videos don't work for you, you mostly do not have
H.264
andMSE & H.264
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There are a bunch of repositories you need to setup.
sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm