If debugging information does not appear check that the theme is outputting the $closure variable.
Installation
Unpack in your modules folder (usually /sites/all/modules/) and enable under Administer > Site Building > Modules.
Requirements:
· Drupal 5.x/6.x
· Drupal for Firebug Firefox extension
Top 4 Download periodically updates information of Drupal For Firebug 6.x-1.1/5.x-1.2 script from the developer, but some information may be slightly out-of-date.
Our script download links are directly from our mirrors or publisher's website. Drupal For Firebug 6.x-1.1/5.x-1.2 torrent files or shared files from free file sharing and free upload services, including Rapidshare, MegaUpload, YouSendIt, MailBigFile, DropSend, HellShare, HotFile, FileServe, MediaMax, zUpload, MyOtherDrive, SendSpace, DepositFiles, Letitbit, LeapFile, DivShare or MediaFire, are not allowed!