I have mozilla Firefox browser installed in my system.I am using it for php and mysql.
I am unable to open phpmyadmin in my localhost.I am able to open local host.the browser tells about 404 forbidden error and it displays can't access the database.

Hi,
I cannot say for sure, but I am using a probably a more archaic system at times for testing and I simply open myPHPAdmin itself and it will open in the default browser (that machine uses four and only NN7.0 has issues.)
Peace,
Clarke