Evan Solomon

The <a href="https://wordpress.org/extend/plugins/debug-bar/" rel="ugc">Debug Bar</a> plugin is great, but sometimes I want to turn it off for a short time. This plugin lets you do that with a keystroke (<code>ctrl</code> + <code>d</code>).
Each time you press the keystroke, it toggles the Debug Bar’s setting for your next request. For example, if the Debug Bar is on and you press <code>ctrl</code> + <code>d</code>, then reload the page, it will not be loaded on the next pageview. Press <code>ctrl</code> + <code>d</code> again, refresh, and it’s back.

Debug Bar Toggle

The Debug Bar plugin is great, but sometimes I want to turn it off for a short time.  This plugin lets you do that with a keystroke (ctrl + d).

Greg Winiarski

BlackBox is symfony like unobstrusive debug bar attached to the top of the browser window.
How can it help you with development: 
1. instantly inspect global variables (GET, POST, COOKIE, SERVER) 
2. debug both frontend and admin area 
3. executed MySQL queries and time it took to execute each query (useful for finding slow queries) 
4. profiler for measuring performance of your plugins and themes 
5. errors occurred when loading WordPress page

BlackBox Debug Bar

Immediate feedback on a great majority of errors. Added a conditional red background to the Errors, and with this modification I have never miss even a notice anymore.

Thank you very much!

Essential plugin in my developer toolset

BlackBox is a plugin for plugin and theme developers. It collects and displays useful debug information (errors, executed queries, globals, profiler).

Debug Bar Toggle vs BlackBox Debug Bar