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Congratulation on the new editor, without UNDO/REDO option, and ctrl+Z / Y option don't work.

Cette critique est pour une version précédente du module (1.2.2). 

The editor is actually provided by Firefox. There is a bug report to add undo/redo key support - https://bugzilla.mozilla.org/show_bug.cgi?id=683172 . If this isn't fixed by the time Firefox 8 is released, I will implement a workaround.