FirePHP can nicely complement the built-in tools available when using Zend Server and can be easily made available to all provisioned sites. This tutorial illustrates how to setup FirePHP 1.0 for all virtual hosts on a Zend Server AMI on Amazon EC2.
Launching Zend Server Instance on EC2
Go to http://www.zend.com/en/products/server/amazon/ and follow the steps to launch an instance.
NOTE: The Zend Server instances launched this way are billed to you on an hourly basis at a rate set by Zend.
The instructions below should work for any Zend Server or Free Zend Server Community Edition installation. The assumption is you are working with a new PHP 5.2+ Zend Server install. If you already have sites provisioned you can adapt the instructions to fit your needs.