Allow applications to interface with the Mac OS X system status bar.
Add an item to the system status bar. Each item can only be present once,
subsequent addItem calls with the same element will be ignored.
The system status bar holds a strong reference to the added XUL menu
element and the item will stay in the status bar until it is removed via
a call to removeItem, or until the process shuts down.
| aDOMMenuElement | A XUL menu element that contains a XUL menupopup with regular menu content. The menu's icon is put into the system status bar; clicking it will open a menu with the contents of the menupopup. The menu label is not shown. |
Remove a previously-added item from the menu bar. Calling this with an
element that has not been added before will be silently ignored.
| aDOMMenuElement | The XUL menu element that you called addItem with. |