Debugging, profiling and tracing PHP code with Xdebug is very powerful, but enabling Xdebug with cookies or adding POST/GET variables is way too hard. This extension will help you to enable/disable debugging, profiling and tracing of your PHP-code easily.
Ctrl+Shift+X (Cmd+Shift+X on Mac) opens the popup.
Alt+Shift+X toggles the debugging state.
Stable version: Go to the Google Chrome Web Store and click "Add to Chrome".
Development version: Download the source from GitHub and load the extension into Chrome yourself!
Pro-tip: Make sure to build upon the latest version of the code and keep pull request as small as possible. This makes your pull request easy to merge.
There is also Firefox version created by BrianGilbert that you could try.
The code of this project is licensed under the MIT license so you can use it in nearly every project you want to, commercial and non-commercial.