Make sure the CSP check is backwards-compatible

The site failed without visible error in older versions of Firefox
Place window.external.AddSearchProvider inside a try {} block

The Microsoft KIN does not have search providers and does not fail
gracefully.
Make sure we add the third parameter for addEventListener
Old versions of Firefox Mobile have a problem with window.crypto
Do not give points for input=image width and height
Input type=datetime returns
Make sure it is clear we only test export format for images
Always submit results first and show a warning if it fails