Yah its possible to download videos in youtube with your laptop what is important do is to open your firefox mozila click on menu bar and then go to Add-ons
and then click Extension, you will see a space that allow you to write something and search on the top of right of your browse.
Now you any software for downloading a videos, But the software must supported by MOZILA FIRE FOX and compacted with Youtube
Just write YOUTUBE VIDEO DOWLOADER and then click enter . NOW you will sea a lot of software that supported by youtube , What is important here is to chose one which you think is the best by considering a number of views if presents.
Lastly click the software and then click the download bar and then follow the instruction to complete the steps.
Finally restart your browse and then go to youtube to start downloading your videos.