About:config is a console for Mozilla Firefox. Using it, a user can edit many advanced settings.
I'll be careful, I promise126.96.36.199 15:04, May 1, 2014 (UTC) Edit
To access about:config, type "about:config" without quotes into the Location Bar and press Enter. Unless disabled, a message will appear advising that some settings, if modified, can break Firefox. To continue, click "I'll be careful, I promise!". You will be brought to the console.