Static preview images only - Stop GIFs from playing

[100% bisexual]

There are galleries where almost every image is an animated GIF.
Takes very long to load on my slow connection.

Can I tell my browser to download only the first frame of each animated GIF?
(at least for the preview images)

I'm using Firefox, but I'll use another browser for Imagefap if I need to.

[longhairfish]

Firefox - yep.

This guy explains it very well.

https://www.ghacks.net/2014/01/23/block ... matically/

I tried it and it works. I double clicked on image.animation_mode. Typed in none. Perfect!