FirePHP can be useful when debugging remote PHP applications on shared or dedicated servers. This tutorial illustrates how to setup FirePHP 1.0 on Magenting which is a managed Magento hosting service. Go to http://magenting.com/ and create an account. This tutorial was prepared by using a Spark account, but it should work just the same with all plans.
He walks you through all the steps you'll need - getting the FirePHP extension installed, getting the PHP libraries set up on the remote server and configuring it to work with your application. A snippet of code is included that can be used to test the connection.