>>29287872
>firefox has a particular format for extensions
This shouldn't matter. Use the userscript version from Github like everyone else. You need a userscript addon like Violentmonkey, then you install the script from here: https://www.4chan-x.net/builds/4chan-X.user.js
Although I think that 4chan-XT (which is a fork of 4chan-X) is more up to date and is getting actively worked on: https://github.com/TuxedoTako/4chan-xt
>The website for 4chan x is dead
No, it's not: https://www.4chan-x.net/ Is this your first time on the internet?

>>29287628
Here are a couple webms from an older vid. I recently remade these because I didn't like how they looped and/or had black thumbnails.