How to download youtube videos in linux and windows without using idm

Its very simple.
Using add ons on you firefox browser.

1. open the firefox browser.
2. select tools>Add-Ons.or press ctrl+shift+A

3. on the right top,locate the search bar.

4. On the search bar,write <download youtube videos>

5. select one of them.install and maybe restart you browser.
6. you can now download videos.