Can I trigger JavaScript's garbage collection?

Question

I want to trigger JavaScript garbage collection. Is it possible? Why would I want to, or not want to, do this?

Answer 1

This answer suggests the following garbage collection request code for Gecko based browsers:

    window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
      .getInterface(Components.interfaces.nsIDOMWindowUtils)
      .garbageCollect();