Hi When I am launch adobe flash project on Win 10 of win 7 ff 57 beta Observe that sometimes adobe flash project does not loads properly, it is showing black screen when switch to other tab or Minimize the browser. If I continue viewing the page then this issue is not replicated. Tested on Below Configuration: 57 beta 11 + 27.0.0.180/27.0..183 Note: Issue is not replicating on stable Firefox 56 + version 27.0.0.183 Mozilla firefox 57 will release on stable channel on second week of November Thanks, Prashant