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Firefox maker Mozilla prepares Gmail-like Thundermail
(www.theregister.com)
A place to discuss the news and latest developments on the open-source browser Firefox
You're right, but I think "hugely profitable" is probably optimistic - I'd expect something to the level of Proton or Fastmail. Fine, but not a big money maker like Firefox is.
Sure, applies to getting to any level of profitability.