How do I make Preview the default PDF reader on Safari?

Question

I reinstalled Adobe and somehow it has become the default PDF reader for Safari. I prefer to use Preview, but I can't figure out how to set it back to Preview.

Answer 1

... a 5-10 minute job. 
in order to change the default PDF viewer in Safari from Adobee, you need to have root user access!
a bit tedious but really a easy task - see below:
How to enable the root user:
OS X Mavericks
From the Apple menu choose System Preferences....
From the View menu choose Users & Groups.
Click the lock and authenticate as an administrator account.
Click Login Options....
Click the "Edit..." or "Join..." button at the bottom right.
Click the "Open Directory Utility..." button.
Click the lock in the Directory Utility window.
Enter an administrator account name and password, then click OK.
Choose Enable Root User from the Edit menu.
come up with a password you wish to use in both the Password and Verify fields, then click OK. (you don't have to remember it forever)
then, log out as yourself and log back in as the root user...
at the login screen, the username will be root, and the password will be the one just made up in Step 10 above.
don't set up with icloud or anything - just cancel any popups that ask for keychain or whatever...just get to the desktop screen and then, from the menu bar at the top of the desktop screen...choose the Go menu....now hold down the option key and another choice on the menu (for the library) should show up...
choose library. 
in the search bar at the top right of the finder window for the library folder, type kind:plugin.... the two plugins should show up.   be sure the search is searching the library folder.
after you have trashed the two adobe pdfviewer plugins, empty the trash and log out as the root user ...
now, disable root user:
to disable the root user
OS X Lion and Mavericks
From the Apple menu choose System Preferences....
From the View menu choose Users & Groups.
Click on the lock and authenticate with an administrator account.
Click Login Options....
Click the "Edit..." or "Join..." button at the bottom right
Click the "Open Directory Utility..." button.
Click the lock in the Directory Utility window.
Enter an administrator account name and password, then click OK.
Choose Disable Root User from the Edit menu.
...sorry this explanation is a bit slapdash... hope you've had success... hit me off with a point if it helps!