I\'m using IEtester to test in IE6, because the client want the page to be seen in it.
Till a few weeks ago, I could work as good as possible using the firebug lite
There is only way to do this 100% correctly and that is running a real version of IE6. Get VirtualBox(Free) and install a Virtual Machine with XP running IE6.
You can try loading older versions of Firebug Lite, like this one which supports live editing of CSS rules:
https://getfirebug.com/releases/lite/1.3/firebug-lite.js
The best way to get support for problems in Firebug Lite is creating an issue report in our bug tracker:
http://code.google.com/p/fbug/issues/entry
Thanks!