failed to get DOMWin for ... spammed to the console

I'm runnning Firefox 18.0.2 on Ubuntu 12.04LTS-64bits.

When I use sabnzb, I can see sometimes, on the console where sabnzdb is launched (sabnzd launches firefox when it starts), a lot of spam from httpseverywhere, linked to the SSL Observartory.

I have outputs like:

failed to get DOMWin for https://trac.torproject.org/tor.css

failed to get DOMWin for https://trac.torproject.org/projects/tor/chrome/common/css/ticket.css

failed to get DOMWin for https://blahblahblah....

SSL Observatory: Cert submission failure 0:

It does not seem to disrupt Firefox, but I'm not sure the observatory really works as it report a failure (but usually... at least on Linux, a return code of 0 would mean all OK and not a failure, so the message is very unclear).

I'm quite annoyed anyway to be spammed in the console, although it might be a side effect as firefox has been launched from the command line (due to launching it through sabnzb)