>>22608>>22617This.
>>22618Also this but I can't find it. Could be the script for the person who had a broken (no, not outdated, actually broken) browser and couldn't display .webp thumbnails.
There is a plugin JS (client-side) option to disable animated .gifs if they are enabled. It might be worth considering enabling the server generating of .gif thumbnails and having that option available if they get abused, or if raids start happening as much as they used to, even enabled by default.