seems to work

src/node/handler/ImportHandler.js

@@ -292,7 +292,7 @@ exports.doImport = function(req, res, padId)
       <script> \
         $(window).load(function(){ \
           if(navigator.userAgent.indexOf('MSIE') === -1){ \
-            document.domain = document.domain; \
+//            document.domain = document.domain; \
           } \
           var impexp = window.parent.padimpexp.handleFrameCall('" + directDatabaseAccess +"', '" + status + "'); \
         }) \

src/static/js/pad.js

@@ -524,7 +524,7 @@ var pad = {
 
     if ((!browser.msie) && (!(browser.firefox && browser.version.indexOf("1.8.") == 0)))
     {
-      document.domain = document.domain; // for comet
+//      document.domain = document.domain; // for comet
     }
 
     // for IE

src/templates/pad.html

@@ -392,7 +392,7 @@
               $ = jQuery = require('ep_etherpad-lite/static/js/rjquery').jQuery; // Expose jQuery #HACK
               browser = require('ep_etherpad-lite/static/js/browser');
               if ((!browser.msie) && (!(browser.mozilla && browser.version.indexOf("1.8.") == 0))) {
-                document.domain = document.domain; // for comet
+//                document.domain = document.domain; // for comet
               }
 
               var plugins = require('ep_etherpad-lite/static/js/pluginfw/client_plugins');