To solve this issue in \public_html\fckeditor\editor\js\fckeditorcode_gecko.js you need to replace
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FCKTools.FixDocumentParentWindow = function(A){ if (A.document) A.document.parentWindow=A; for (var i=0;i<A.frames.length;i++) FCKTools.FixDocumentParentWindow(A.frames[i]);};
with:
Text Formatted Code
FCKTools.FixDocumentParentWindow = function(A){try{ if (A.document) A.document.parentWindow=A;} catch(e){};for (var i=0;i<A.frames.length;i++) FCKTools.FixDocumentParentWindow(A.frames[i]);};
Ben
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