Correct me if I am wrong but the borders of the RadEditor on the provided screenshots are the same, except in FireFox 3.63. I am unable to reproduce the problem using FireFox 3.68. Could you please try to upgrade the version of FireFox and see if the problem still exists. If not the problem was most probably caused by a problem of the browser which was fixed.
I have attached a screenshot demonstrating the RadEditor borders on my side in Chrome 6.0, IE8 and FireFox 3.68.
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