how to download youtube video without using any third party

how to download youtube video without using any third party...
oepn web browser 
go to youtube site
select which one you want video to download 
and select that video then pause video
go to on address bar remove https://www. this things 
and type istead of that "ss" then press enter 
you will see download link and select what you want mp3 or video and select and click on download button ....

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