1-starring this to spread further awareness that both the extension and the author of this Firefox port are ingenuine to the original project, as per author's (Igrigorik) disclaimer on their Github issues page. Avoid installing/using.

Sketchy af. The original author disavow this add-on. github.com/igrigorik/videospeed/issues/1511

I'm glad to see the original developer's version on the Firefox Add-ons Store, not just a fork. The forked version caused performance issues that slowed down Firefox for years and was left unmaintained for a long time, so I hope those problems have been resolved in this original release.

As of now, the latest version of the Video Speed Controller add-on for Firefox is 0.9.5, released in October 2025. I would appreciate it if the more recent version, 0.10.2, could also be made available for Firefox.

I've tried a whole bunch of add-ons from outdated versions of this add-on, and this is the only add-on that works great with vkvideo.ru . Thank you for continuing to contribute and improve this add-on.

works