Tips for those who dont want to trust the extension: you can use the extension to make the changes (and then uninstall it)... as long as the page DOES NOT REFRESH, the voice changes are retained!

do ts with speed and pitch 1.2 youtube.com/watch?v=WEQhIdgm0aQ

Perfect add on for karaoke. A must have!

Love it! Now I can finally sing karaoke in lower keys!

This addon is pretty much as good as it gets when it comes to Speed/Pitch Changers, on ANY browser. This addon absolutely TRASHES on the largest one on Chrome (transpose.video), with the latter having to thank it after. Obviously nothing even remotely compares on Firefox or anything else. Excellent work easily one of the best addons a web browser can have, and a genuine W for Firefox.


I strongly agree with the other review on this being very worth porting to Chrome though.

I'd really love if the creator could make a version of this extension for Chrome.

worked better than i would have thought, very good

This was exactly what I was looking for, and has served me well for over a year. I can change the speed and pitch independently and easily.

Love it! Best add-on to be able to 'Nightcore' your music wherever you listen to it.

Small issue, though: Doesn't currently seem to work in Spotify, though. It will change the song for a few seconds before it goes back to normal.

Works great! Top buttons change speed & pitch, bottom buttons change pitch by semitones (independent of speed). Well done!

Such a simple, incredible tool. The musical accuracy is very useful and so is the proportionality and lack of quality loss. Having great experience with it by giving new life to songs by the click of a button.

Fantastic addon for desktop version of Firefox.

Suggestions/ideas for the future:

[01] A 'Preserve Speed' slidebar option. Self-explanatory: pitch can be changed without affecting playspeed.

[02] Dedicated behavior modifier functions (additive, multiplicative) for play speed and pitch, separately.

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As of this posting date, this addon exhibits the following issue in Firefox Beta (Android):

[01] Within the menu interface, switching the On/Off slider to 'ON' position reverts back to 'OFF' position upon exiting, as well as forcing the active page to reload.

You can no longer change the settings or use commands

Does as good of a job with speed change as premium software. Thanks guy