Can I delete my recent insert in browser preferences?

I just entered an incorrect insertion in my browser preferences.
I think he could have just barely out of a few empty spaces and now I want to just delete it and try again.
But there were warnings beforehand when I opened "Prefs" to be VERY careful.
I want to just DELETE it.
Ok?
Should pose no problem, humble?
I don't know what I'm doing. I just followed the instructions and made a small mistake and want to cancel it.

I have a macMini last SnowLeopard.

If you have added a new preference by typing about: config to remove right click (or Ctrl-click) on the preferences and click Reset. Preference will be removed when you restart Firefox.

Tags: Firefox

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