About:config doesn't open the configuration window

I updated to version 3.x and the text on my homepage was huge. I tried to enter about:config as suggested, but, no configurations window. It just opens a window that says "config" at the top. about:config works in all previous versions but when I try it in the upgraded version the window won't open
== This happened ==
Every time Firefox opened
== I upgraded to version 3.x

Try http://kb.mozillazine.org/Preferences_not_saved and [[Preferences are not saved]]
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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