MDN’s new design is in Beta! A sneak peek:

Not in SeaMonkey 1.x
Type: comma-separated list of strings
Holds a comma-separated list of the IDs of the items currently on the toolbar. For spacers, separators, and flexible spacers the following strings are used instead of IDs: "spacer", "separator", "spring". An empty toolbar has a currentSet value of "__empty".
You may change the current set of items by setting this property. Be careful, as setting this property doesn't automatically update the currentset attribute.


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 Contributors to this page: Sheppy, jswisher, Philip Chee, Marsf, Mgjbot, Nickolay, Dria
 Last updated by: Sheppy,