First you have to edit about:config and add:
browser.dom.window.dump.enabled setting it to true.
Then when you start the browser pass it the -console parameter. Then it will start up with a console so you can see all the messages from dump()
What would be nice is if this option works for xulrunner aswell...

2 comments:
This option works for me with xulrunner on windows..
just add : pref("browser.dom.window.dump.enabled", true ); to the prefs file in \defaults\preferences\
and add -console to the parameters when starting.. then dump() works
I can also confirm it works for me in linux as well.
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