On the Symfony blog there's a new post that's the first part of a series they're writing on combining the FireSymfony plugin with Symfony framework applications and the Firebug Firefox plugin to debug applications.

FireSymfony saw the light of day on october last year. One motivation to do it was to integrate two of my favorites web debugging tools, Firebug and the symfony web debug toolbar (SWDT). Also with some fellow developers we were trying to address a problem caused by the SWDT in some of our projects, where the HTML injected by the SWDT was not compatible with our design, making the site looks "broken".

I started hacking some code by reading some tutorials on how to create a Firebug plugin among other resources on the web. [...] Last saturday it became a Mozilla certified add-on, meaning that users don't have to register to download the extension and they will be notified of extension updates.

The tool allows you to directly set debugging information into the Firebug console and can include request variables, user session information, installed PHP extensions and the Symfony install version.