JamesD, just as you wrote, works fine.
/** ADD SEPARATOR **/
const JSB = Components.classes['@kmeleon/jsbridge;1'].getService(Components.interfaces.nsIJSBridge);
JSB.SetMenu('Misc', JSB.MENU_SEPARATOR, 1, '', 1);
/** REMOVE SEPARATOR **/
const JSB = Components.classes['@kmeleon/jsbridge;1'].getService(Components.interfaces.nsIJSBridge);
JSB.SetMenu(
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