Google offers an API for developers to write their own DevTools panels, to add whatever functionality might be needed for a particular developer, team, or application.
Even better than writing extensions ourselves is to make use of the work of others. Chrome lists some featured DevTools extensions on their website; a quick Google search will turn up others. You can find extensions to make easier the process of debugging and evaluating platforms and libraries like Ruby on Rails, Angular, and Ember; tools to better diagnose page speed; and tools to extract code snippets for sharing with others.
In the next exercise, we'll ask you to install and try out one of these extensions.