How to open locked facebook profile picture?

This trick is represented by Kashif Saleem
1.open facebook profile of target!
2.Right click on facebook profile pic and click "open a new tab"

3.opened a new tab..& see the link

4.Change the 160 to 720......(which u want e.g 480p 720p 1080p)

5.And press enter ...& see the magic!