You will need to install a user script manager extension to install this script.
On LinkedIn.com hides the fake email-only contact cards to "Invite" which are mixed in with real profiles you can "Connect" to for LinkedIn.com - My Network - "People You May Know"
NOTE: You must scroll downwards at least once to start the endless loading of contacts. Therefore, if you don't see any vertical scrollbars (eg. if almost all contacts were invite-only removed ones), then you can either zoom in (eg. Ctrl + =) or resize the window smaller until you see vertical scrollbars, and then scroll downwards to begin endless contact loading.
By Dan Moorehead