I think these extensions set the standard playbackRate property on the HTML5 video element: https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/pl

I think these extensions set the standard playbackRate property on the HTML5 video element: https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/playbackRate https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaEl... Try setting the property manually using the JavaScript console and see if you get pitch correction. If not, maybe make sure you're on the latest version of Firefox?