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html - UndoManager support in Firefox

I'm a little confused about how to use undoManager in Firefox. According to Mozilla, Firefox 20 now has support for it, but I can't figure out where. I've checked under document, Objects, etc., but can't find it anywhere. I'm sure I'm missing something obvious, so can anyone help?

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You have to set the "dom.undo_manager.enabled" preference to use it, so far, since the spec is still in flux.


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