URL change crash

I changed my website URL (http://localhost:8888/wordpress/) from settings so it crashed. Then I managed to fix it by going to http://localhost:8888/wordpress/wp-admin and now I can access every page in my website EXCEPT the home page!
Whenever I try to press “Visit site” or type in http://localhost:8888/wordpress/ it directs me to http://localhost/wordpress/ and gives me the “Unable to connect. Firefox can’t establish a connection to the server at localhost” message.

Please help.
Thanks