Add the ability to add multiples of the same items/buttons on the customize firefox menu

[LiaLia407]

i would like to have the option to add buttons in multiple locations in firefox, however whenever you drag ond drop items in the customize firefox menu they disappear from the list (i.e. can only be used in one single location), i would like to put them in multiple locations (for example the extensions button in both the toolbar and the bookmarks bar)

[Jon]

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