How To View Facebook Private Profile Photo In Large Size?

Hello guys, i found a very interesting  trick; how to view Facebook profile photo in large size.  As we all know that due to Facebook privacy security sometimes we will not able to view profile picture of our friends in large size.
In this tutorial i will teach you to view Facebook private or locked profile picture in large size.
1.  Open Facebook profile of person whose profile picture is locked or is set to private.

2. Right click on the profile picture and click on Copy Image Url (for chrome) / Copy Image location (for Firefox).

3. Open that image in new tab, by using that copied link of image.

4. Now change the value of image size highlighted below which might be s160x160 to s720x720 (If its not clear try s320x320)

ENJOY :)
NOTE: This trick does not always work.