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"Use of Mutation Events is deprecated. Use MutationObserver instead." warning in Firefox #9300
I am not really sure which widget this actually triggers this, but it somehow originates from inside of the qooxdoo framework and not the application code (possibly qx.ui.embed.Iframe related?).
I am using qooxdoo 5.0.2 and Firefox 52 64-bit on Windows 10.
It could be that DOM-Events will be deprecated in the future.
referenced this issue
Apr 18, 2017
By the way: The original issue was, that "relocating" the iframe into another container did not re-render a changed source-URL:
...but isn't that something that shouldn't be done?