OK, just downloaded and installed firefox 2.0.0.3.
Even before I downloaded and installed firebug, the config page DOES show up normally when opening it with Firefox. It still does not show up opening with IE 7.0.5730.11 or Maxthon 1.5.9.
In this case, will it still be useful if I do something with Firebug? If so, I’ll be pleased to help, just let me know what I am looking for.