How to install GenYoutube extension for Firefox?
Add the GreaseMonkey extension for Firefox. GreaseMonkey is needed for our widget to work properly, click "Add to Firefox" to install.
Once GreaseMonkey is successfully installed, click below button to add our widget to your browser.
Browser will ask for confirmation, click "Install" as shown below.
That's it! Our widget is now installed on your browser. Simply click on our widget while browsing YouTube to start download video!