Index: /FCKeditor/trunk/_whatsnew.html
===================================================================
--- /FCKeditor/trunk/_whatsnew.html	(revision 295)
+++ /FCKeditor/trunk/_whatsnew.html	(revision 296)
@@ -76,4 +76,6 @@
 		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/467">#467</a>] If InsertHtml was
 			called in IE with a comment (or any protected source at the beggining) it was lost.</li>
+		<li>[<a target="_blank" href="https://sourceforge.net/tracker/?func=detail&aid=1518766&group_id=75348&atid=543653">SF
+			BUG-1518766</a>] Mozilla 1.7.13 wasn't recognized properly as an old Gecko engine.</li>
 	</ul>
 	<h3>
Index: /FCKeditor/trunk/editor/_source/internals/fckbrowserinfo.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fckbrowserinfo.js	(revision 295)
+++ /FCKeditor/trunk/editor/_source/internals/fckbrowserinfo.js	(revision 296)
@@ -42,5 +42,8 @@
 	{
 		var geckoVersion = s.match( /gecko\/(\d+)/ )[1] ;
-		browserInfo.IsGecko10 = geckoVersion < 20051111 ;	// Actually "10" refers to Gecko versions before Firefox 1.5, where Gecko 20051111 has been released.
+		// Actually "10" refers to Gecko versions before Firefox 1.5, where Gecko 20051111 has been released.
+		// The last Suite using the Gecko 1.7.13 was released on 20060414, but there might be other non-officially supported builds
+		// so let's check also for rv:1.7.x
+		browserInfo.IsGecko10 = ( ( geckoVersion < 20051111 ) || ( /rv\:1\.7\.\d+/.test(s) ) ) ;
 	}
 	else