[n-tres-ted]

I just get an error page saying server can't be found. However, I just googled the about:config and I think I have found the right page. Let me give it a try. Thanks.

[ShadowAce]

I just get an error page saying server can't be found.

Are you putting "http://" in front of the about:config? If so, remove it. about:config is local to the browser is should not have a protocol associated with it.