Browse Friendship is another great feature by Facebook
It is actually a mutual page which shows the content and connections shared by two people who are friends, including photos they’re both tagged in, wall posts and comments between them, Events they both RSVP’d to, and their mutual friends and Likes.
You just have to visit your friend’s profile in order to view that mutual page.
On your Friend’s Profile you will see a place where its written ‘See Relationship’ (Right side of the page).
It will take you to the mutual page.
You don’t have to repeat this step for viewing your mutual page with your other friends.
In the same mutual page, on the right side you’ll see a tab ‘Browse Friendship’ and there you can type in the names of your two friends and that will take you to their mutual page.
Now here what I noticed a change in the URL
See the Diagram below to understand :
Some Facebook users have assigned a name to their profile but some have the profile ID.
Go to your friend’s profile and notice the URL and then have a look at the diagram