How to get a video that you've just watched on youtube without downloading it !

Hey guys,how are you doing? have you ever watched a YouTube video , liked it , and wanted to get it ?
well, I've you've already watched that video, then, believe it or not, it's already downloaded. you just have to do some tricks to get it.I'll explain these tricks here

Before you continue reading this post,you should know that this trick works for windows in Firefox, Chrome and Opera , maybe other browsers , but I'm not sure
well, here we go
1 - If you feel like the video, then just go to start and  type ( %temp%) without brackets and hit enter

 It'll be better if you did that step before the video is fully loaded , it'll make things easier

2 - take a look at the %temp% folder structure