Bug in Firefox on Stream.show()

Hi,
I need to hide and show one stream in my web page. With Chrome it’s ok, but
in firefox I have a black video whith the “loading” gif.

The bug is reproducible with the Basic Example. This is the “index.html"
for testing.
I added two button “hide” and “show” for the local stream. After click
"hide” and “show” in Firefox appears the black video.

Licode Basic Example
<button id="recordButton" onclick="startRecording()">Toggle 

Recording
Hide Local
Show
Local

</div>