SVG in Firebug, large memory leak?

Using this version of Firebug:

http://fbug.googlecode.com/issues/attachment?aid=4515682982516050731&name=firebug-1.5b8pre-r5349.xpi

And going to this site:

http://tutorials.jenkov.com/svg/svg-examples.html

And right-clicking on some SVG thing like the circle or rectange, and
you see something like this:

http://fbug.googlecode.com/issues/attachment?aid=1877902685949581625&name=Capture.PNG&inline=1

Now if you play in the style tab and turn on/off the fill and stroke,
etc a few times you can see the memory usage go up megabytes at a
time. Hitting reload makes it worse. I don't know what would be
causing such a heavy memory usage. Any ideas?

-steve--