After a fruitful conversation with Nicolas Pastorino, he said me that he was waiting the new version of eZDebug. I was focusing on other extension so I completely forgot that. So, I've started the development of the version 1.0 fore Firefox3, in six monthes dev tools have evolved (happily for me) and it will be easier to test and develop. I will make the following arrangements :

• It won't be in a new window but in the sidebar or in a new tab (like the magic CTRL+MAJ+C).
• It won't be necessary to hack the kernel --> So it can be used for any eZ instance.
• It will be possible to filter by category or by typing something.
• A clear "debug button" will allow to hide the debug in the internet page.

If you got some remarks or suggestions on this, just leave a comment.