IT WORKS! Just make sure to reload your tab so everything shows up. Thank god for playspeed settings for crackheads like me.

It's great, gets rid of the crap Crunchyroll says is a video player, and changes it for a better one with useable features.

Juste PAR-FAIT !

Maravilhoso! Era isso mesmo que estava procurando de extensão e essa foi a única que encontrei pro Firefox que atendesse esses critérios