It makes all the gifs stop playing.

Didn't do anything. Did not work with Firefox 77.0.1

Could you remove the items of the right-click menu?

I just started using this extension a few minutes ago.
After many years of searching, it seems I finally found one that actually works like I want.
Sweet!

Nice, but prevents Video Speed Controller from working even when its not on but just actively installed.

Brakes youtube speed options.

I would prefer at least 15 slicers over FQ but otherwise seems quite good.

最高です！！
Android版Firefoxでも使えます。
PC・Android共に愛用しています。