The name stands for Music Frequency Changer . The purpose of this project is to allow user in web browser like Firefox,Brave,Chrome,Safari etc. change frequency/pitch of sound to different that 440 Hz because of unhealthy of effect 440 Hz frequency. So yes,this is against music industry.
Tested chromium based browsers and firefox.
Download this repo
git clone https://github.com/Honzasko/MFChanger.git
Type into url about:debugging and then add temporarily addon and select manifest.json Note: you need to do this everytime you start firefox
Go to settings then addons,enable developer settings then load unpacked and choose folder of this plugin