Other extension are laggy and buggy , I make a mozilla id just to review this extension . Very nite extension.
Great works like charm.

非常好扩展，使我的课程16倍速播放

Simple but really useful

Tried a few different speed extensions/addons (including userscripts), but settled on this one.

This is the speed Add-On that will stay active when the page is refreshed. This is the only one I have found so far that is persistent. The mappable keys for speed control are awesome as well.

very good，I like it very much.

An ADHD must-have add on. I've tried it on Youtube, Hulu, and Disney Plus. Fast speeds when the video pacing is too slow for my neurospicy brain. 16x through ads like a dream. THANK YOU.

It is good but twitter videos and GIFs was stuck .

good