title: Firefox operation is insecure
body: <p>My code works both with ie and chrome, only firefox fails with this error.</p>
  
  <p>I have added an ajax request with url to my container.</p>
  
  <pre><code>Ext.Ajax.request({
              url: 'attachment/uploadAttachment',
              scope: this,
              params: {
                  projectId: this.projectId,
                  draftNumber: this.draftNumber
              },
              success: function(form, action) {
  
              },
      })
  </code></pre>
  
  <p>I`m using ext js 3.4 framework for my ui side.</p>
  
  <p>I get this on firefox :</p>
  
  <pre><code>{"raw":["SecurityError: The operation is insecure."
  "http://localhost:8080/MySupplierInvoices/plugins/my-apps-ext-js-common-0.1/js/overrides/Ext.form.Field.js?_debugResources=y&amp;n=1380786192461"
  21]
  </code></pre>