4chanx image expansion not working for .mp4 files on firefox

[UnknownVariable102]

I've moved over to Firefox from Chrome after they disabled 4ChanX, and everything mostly works other than image expansion, image hover, and gallery view for .MP4 files.

When mousing over .webm files, it will show the full video and when clicking on it, it will open, and start playing the file in the tab. Then, when in gallery mode, it will autoplay videos as usual.

Yet, when hovering over .mp4 files, nothing happens, when clicking on them, it opens a new tab for the video, and they don't appear in the gallery.

I was messing around with enhanced protection (set to custom > unticked every option), and they briefly worked, but i can't replicate it, and it's still not working.

Any assistance would be appreciated.