Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

When I type about:config, a list shows up how do I delete an item from that list?

  • 1 reply
  • 6 have this problem
  • 7 views
  • Last reply by cor-el

more options

How do I delete items that come up when on the address line I type About:config

How do I delete items that come up when on the address line I type About:config

All Replies (1)

more options

You can reset a pref to the default value via the right-click context menu.
Then that pref will be removed if you close and restart Firefox in case that pref doesn't exist by default (i.e. type is string and shows nothing in the value field after the reset).
Prefs that have a default or a user set value can't be removed.


  • Use the Search bar at the top of the about:config page to locate preferences more easily
    • Preferences that have been modified and do not have the default value show as bold (user set)
  • Preferences can be reset to the default via the right-click context menu if they are user set
  • Preferences can be changed via the right-click context menu: Modify (String or Integer) or Toggle (Boolean) or by double-clicking the line with the pref
  • Preferences can be created via the right-click context menu: New -> String, Integer, Boolean

Modified by cor-el