Fix for this issue : http://code.google.com/p/fbug/issues/detail?id=5958
I am wondering if the use of MutationObserver is right, since the feature has been introduced in Firefox 14 (and this version of Firebug seems to support Firefox 13 according to install.rdf).
Fix issue 5958
Thanks, it works for me!
Anyway, I think that the following: "timeout = setTimeout(compareAndCallback, 1000);" line is rather a hack.
I am merging anyway, to see what the test bot says...