localhost/phpmyadmin showing blank page on firefox web browser, localhost is working well, localhost/info.php is working well too?

Creating a Database with PhpMyAdmin To install WordPress, we will first need a MySQL database. To create a database, we enter http://localhost/phpmyadmin/ from our browser.

As you can see on the bottom page, there will be a section. Here we will come to the databases section and create a database. Click yaparak Create yaparak by typing its name (Example: wp_test) and utf8_general_ci into the encoding type.

you can retry from here, your issue is solved ?

See if the configuration was installed properly, and if not enable it:

# The following should show that the configuration was enabled
a2query -c phpmyadmin

# If it was not, then enable the configuration
a2enconf phpmyadmin

Warning: don’t forget to properly secure access to that page, with a minimum of strong password for all db logins.