Autoplay videos in Icecat

[znavko]

Hello, users! Can you recommend something to make Icecat autostart videos (that 
are really autoplayable and start when I use another browser).
I cannot remember what I did, but I had this on my laptop. Now I've installed 
Guix on PC and do not have autoplay videos in Icecat.
ddg.gg did not answer me.
Please, how autoplay videos in Icecat?