How to set up FirePHP + Webug?

Question

PHP

Connected FirePHP , installed extension for it in Chrome - Webug .
I write in code

require_once "library/firephp-core/lib/FirePHPCore/fb.php";
    // Вывод текста в консоль
    FB::info("1111");
    FB::error("2222");

and texts 1111 and 2222 are displayed in the console. But if I output something to the document after this code. For example
echo "asd";
, the console is empty.
Who connected, what could be the reason?