> With Send you can share file sizes up to 1GB quickly. To send files up to 2.5GB, sign up for a free Firefox account.

From the blog post linked in this topic.

Edit (to address your edit about marketing emails and privacy):

Respectfully, I disagree. Privacy issues center around the invasion, and in extreme cases outright elimination, of privacy of individuals. This is when entities use (your) data to identify you even when you are trying to stay anonymous. When it becomes impossible for you to have privacy.

To be honest, this central issue has a fairly vast umbrella...but no, taking an e-mail (without a name even) and placing it on a marketing campaign list with explicit user consent via a true opt-in does not fall under that umbrella in my opinion.

Right below the big "drag-and-drop here to send up to 1 GB"? (insert exact english text here, translating the translated version I'm shown)

Also, to get to the second point: you didn't click the opt-in checkbox and still got marketing e-mails?

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FWIW, Mozilla is one of the orgs where you probably can write their privacy people an e-mail and they'll actually look into it.

(Just signed up for a new account, will do that with a GDPR template if I receive unwanted e-mails)