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WikiBooks:Using_Firefox/Advanced#about:config
http://kb.mozillazine.org/About:config_entries
Ten mysteries of about:config

 

delete preference

Not possible to delete preferences from within FF without restarting.
suggested by this thread

  1. right click on preferenceName
  2. select reset
  3. restart firefox, and it’s gone!

 

Alternatively, close browser, edit the prefs.js file, and restart. Maybe, you know, make a back-up, first.

 

http://www.velocityreviews.com/forums/t9891-delete-entry-from-aboutconfig.html
http://kb.mozillazine.org/Resetting_preferences