uses
  ceflib;

procedure TForm1.ChromiumBeforePopup(Sender: TObject; const browser: ICefBrowser;
  const frame: ICefFrame; const targetUrl, targetFrameName: ustring;
  var popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient;
  var settings: TCefBrowserSettings; var noJavascriptAccess: Boolean; out Result: Boolean);
begin
  // returning True to the Result will stop creation of the popup window; you can make a
  // filter just for certain URLs, like e.g. if targetUrl = 'http://example.com' then
  Result := True;
end;