1. Install Zend Debugger Toolbar for Firefox from http://www.zend.com/en/products/studio/downloads
2. Open PhpStorm and enable listening debug connections:
3. Open Firefox and go to the Extra Stuff -> Settings:
4. Ensure the "Auto Detect Settings" is selected and check that "Zend Studio Broadcasting Port" value is equals to "Settings broadcasting port" value in PhpStorm. Press "Test" button to check connectivity.
5. You are ready to use Zend Toolbar with PhpStorm!