If you're interested in viewing private Facebook albums, then 2015 is going to be an interesting year for you.
Facebook has really doubled down on its efforts to secure people's private data, in light of some very serious security breaches, hacks and leaks in the past 2-3 years.
This makes is almost impossible to simply download a piece of software that's going to unlock people's private Facebook profiles.
If you really do want to access someone's private Facebook profile in 2015, then your best bet is to simply send a friend request.
If you're worried about exposing your identity, then try using a fake name and photo.
And if the user doesn't accept Facebook friend requests from strangers, then this may a sticking point - but with a little creativity, I;m sure you'll find a way to work around it.
Whatever you do, try to keep it ethical. If you get reported, then you might loose access to Facebook altogether.
And in extreme cases, you might find yourself on the wrong side of the law too!