I had to migrate a multi-site installation of Drupal from one server to another, and devised a way to copy all the relevant MySQL databases from the old server to the new server with a single bash command. It is secure as it is piped through SSH. Hope someone finds this useful.
The DOM Inspector is a built-in Firefox extension that "can be used to inspect and edit the live DOM of any web document or XUL application." I had never found the DOM Inspector useful by itself, but some components of the (very useful) Web Developer extension rely on it.