You can download any Facebook profile photo by right clicking on image, you just need to do some extra work.
On any Facebook Profile, right click on main profile pic, choose “Save image as” the name of image pic will come as pic.php, you just need to remove php and add jpeg. In Save as Type> “JPEG” should be selected. Just change file name pic.php to pic.jpeg and save it on desktop as JPEG file. That’s it, Facebook profile image is saved now.
If you are not seeing any extension of image (i.e .php or .jpeg at the end of name), Change the following setting of your Computer system
Open My Computer > Tools > Folder options > View > Remove the selection from “Hide extensions for known file type”.
After changing the Windows setting save Facebook profile pic as above. It will sure work.