FlashFirebug provides a visual representation of the DisplayObjects inside the SWF file as a tree. The tree displays the DisplayList structure, DisplayObjects' names and types. The Display Tree utilizes icons and styles derived from Adobe Flash IDE which are familiar to all Flash developers and designers.
Using FlashFirebug tree you can debug multiple SWF files on the same page.
The display tree dynamically updates as new elements are added/removed from the SWF.