How does Firefox handle xml:base when generating GET requests for SVG image elements?

I am loading an SVG image at the following URL:
http://localhost/howl/svg/id/543
The source for this SVG code is:
<svg xml:base="/howl/">
<svg width="535" height="325" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<image xlink:href="file/id/532" />
</svg>
</svg>
As you can see, the SVG code is located at one path, but the <image> is relative to the root, hence the wrapping xml:base attribute.
The actual requests in Firefox, according to Tomcat Logging are:
GET /howl/svg/id/543
GET /howl/file/id/532
However, Firebug's Net tab shows these requests:
GET /howl/svg/id/543
GET /howl/svg/id/file/id/532 (Incorrect, doesn't happen)
GET /howl/file/id/532
When I test the same thing in Safari and Chrome, all three GET requests actually happen, the incorrect one resolving in a 404.
I suspect that Firefox is generating all three requests, but discarding the incorrect one and Firebug is not aware of this. As a result, Firebug shows all three requests, but the incorrect one never resolves.
So, I'm curious about the behavior or whether I am doing this incorrectly.
Thanks!

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