it works great!

Most of the times it works well. The only concern i have is the dev is not actively updating it

Good addon, simple to use

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

This extension works great, particularly with the configurable keybinds to control speed, and to seek.

One of my favourite features is the ability for this extension to affect advertisements in youtube.

My most common use for this extension and the reason for downloading it is to speed up videos past 2x speed (most commonly to watch lectures at 4x speed).

However, on my M2 MacBook running Sonoma 14.3.1, Firefox version 123.0, this extension often takes up 2-7GB of RAM. This is not an issue on my Windows 10 PC. I'd assume this is due to a bug causing the video cache to not be cleared often enough.

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.