It didn't work? Which interface you're using? The classic or the new one? Try cleanning the cache and reseting Safari. Go to the menu Safari > Reset Safari then click on OK.
Then, open terminal and type the commands listed bellow(some commands will require your admin password):
cd /
cd library
cd caches
sudo rm *
sudo rm -r *
cd /
cd users
cd YOURUSERNAMEGOESHERE
cd library
cd caches
sudo rm *
sudo rm -r *