Debug Bar is WordPress Plugin for Developer. This plugin really useful for Plugin Developer and Theme Developer. Why each developer must install this plugin?

WP Debug Bar Screenshot

Adds a debug menu to the admin bar that shows query, cache, and other helpful debugging information.

When WP_DEBUG is enabled it also tracks PHP Warnings and Notices to make them easier to find.

When SAVEQUERIES is enabled the mysql queries are tracked and displayed.

How To Install Debug Bar WordPress Plugin

1. Go to Your WordPress Dashboard
2. Then Go to Menu Plugin > Add New Plugin and began Search Debug Bar
3. Then Install it, now you are done.

It’s really interesting right? You can download Debug Bar WordPress Plugin on this page.