Well I've been editing a lot of content using the rich-text editor and firefox, and I haven't had that problem. I occassionally find that firefox just won't let me type in the text area, so then i have to go back and re-click the link to open the page again. But I haven't had the error you're talking about. What version of firefox are you on? I'm on the latest, 1.5.0.1, and like I said, that's fine.
To be honest, this sounds more like a firefox compatibility problem than a devfusion problem - as the editor works fine in IE and firefox 1.5.0.1, it's probably just an incomptibility or a bug with an older version of firefox.
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