Try opening a private browsing window in Firefox and see if it works in there. If it does then I suspect its a cookie issue not a cache issue. You can try clearing the cookies for only thecmp.org if you're savvy enough to do that. Or try installing Chrome (google.com/chrome) or try Edge browser which is built in.
I've had a problem with the CMP site before and clearing the cookies fixed it. But generally you don't want to clear all the cookies, just the ones for the problem site.
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