MDN’s new design is in Beta! A sneak peek:

Return type: no return value
Resets the preference to its default value.
For a textbox it also clears the undo transaction list (Gecko 1.9).

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 Contributors to this page: Sheppy, trevorh, Marsf, BenoitL, Mw22, Dria, Nickolay
 Last updated by: Sheppy,