message: Removed dynamic appending of the sandbox iframe
diff: @@ -96,14 +96,6 @@ if (browser.windows) {
  firefox57WorkaroundForBlankPanel();
  }
  -if (parser(window.navigator.userAgent).browser.name !== "Firefox") {
  - const sandbox = document.createElement("iframe");
  - sandbox.setAttribute("id", "sandbox");
  - sandbox.setAttribute("src", "sandbox.html");
  - sandbox.setAttribute("style", "display: none");
  - document.body.appendChild(sandbox);
  -}
  -
  @DragDropContext(HTML5Backend)
  @observer export default class Panel extends React.Component {
  constructor(props) {
  