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and then found myself to
http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/

and http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.5.7/source/firefox-3.5.7.source.tar.bz2

Though once I have firefox-3.5.7.source.tar.bz2, how do I import the
upstream sources to xulrunner and iceweasel?

Could you please give me some pointers? Some packages have a upstream
or get-orig-source target which would be useful to populate.

With thanks,