FireRainbow breaks Firebug's tooltip inspector

When FireRainbow (v1.0) is enabled, Firebug (v1.3.3) loses the ability to show tooltip data for anything other than the parent object.

For example, say I have the code:
   this.widgets.okButton = ...
at runtime, I can hover over "this", but not "widgets" or "okButton".

With FireRainbow disabled, it's possible to inspect all three values by hovering over them in turn.
