I dont think I understood you completely.. Javascript debugger: Something you use to debug javascript. but Formaldehyde dosent make any seance if xhr object is not used. PHP Debugger: We cant use Formaldehyde to debug errors in every single PHP script. I am talking about pages called directly via the browsers URL bar. FirePHP on the other hand can be used with all PHP scripts. AJAX Debugger: I think the example given in Formaldehyde Google code page fits this category. If not may be you can give an example ? @Andera May be you should consider using application/json as the content type instead of text/plain. The Response text given by Formaldehyde cannot be understood manually (for example if I use jQuery.load()). Had the content type been application/json firebug parses it by default -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php