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Ummm, I run Mozilla 1.0, is there an update?
Wait, here's something interesting ... I just updated that other site you saw
with your latest edito, but NOT the latest koivi. ie the version of the editor was the older one that came with the first 2.3.
Guess what, the editor works perfectly in mozilla! So your latest module version and the older koivi seem to be the best conbination so far.
Havnt done deep tests yet, but at least its usable cross browser.