about:config is a feature of Mozilla applications which lists application settings (known as preferences) that are read from the profile files prefs.js and user.js, and from application defaults. Many of these preferences are not present in the Options or

If Firefox is open, close Firefox: Click the Firefox menu and select Exit. Click the Firefox menu at the top of the screen and select Quit Firefox. Click the Firefox menu and select Quit. In Terminal run: firefox -P; The P is capitalized. Alternatively, y

1. Access Hidden Secret "about:config" Page in Mozilla Firefox. You must be already aware of this page because we have posted so many tutorials about this secret page of Firefox. "About:config" page allows you to tweak lots of hidden s