null is not an object

First of all I, like everyone else, love Firebug!

However, I noticed yesterday that Firebug seems to have a problem reporting the true status of cached pages in the Net tab. With a simple page that has one JavaScript file included the Firebug report looks like this:

While if you look at Fiddler it says this:

Firebug will occasionally report that the resources have been cached but Fiddler consistently reports the 304 “Not Modified” HTTP header.

Am I doing something wrong here? Is there a great Firebug feature that I am missing?

If not then Joe can you pls fx it

Tags: firebug.