I don’t believe it!
Seen on my Firefox browser just now:
“This presentation contains content that your browser may not be able to show properly. This presentation was optimized for more recent versions of Microsoft Internet Explorer.
“If you would like to proceed anyway, click here.”
. . . and they weren’t kidding, either. A web page totally useless with Firefox. And it’s a worthless site portal page to boot.
Why would anyone DO that?