How to download youtube videos with one click

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For Mozilla Firefox:
If you are using mozilla firefox,it is very easy to download youtube videos.
open mozilla,
open Tools>Add-ons
&  select Get Add -ons
In searchbar type "1-Click YouTube Video Download "  & press Enter
&  then press "Add to Firefox" & after that click "Install now".
w're done.
Open any Youtube video,below video,there will be a option in which format you like to download it.click any format you want to.
w're done.