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In one of their videos, the URL is www.send.firefox.com - the others drop the www - is this intentional, a mistake? Why would someone use www before a sub domain like that?

Looks like www.send.firefox.com was a mistake. It's not a valid way to access the service. The correct url is send.firefox.com.

Because some people just don't recognize a Web address if it does not start with www. I see that all the time with our subdomains.

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