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Re:Firefox Send: Free encrypted file transfer service by timvisee on Tuesday March 12, 2019 @11:31AM (#19369098)
You got it! The only thing you'd have to worry about is malicious JavaScript on the Firefox Send website which I believe would be highly unlikely. And of course, you must keep your link secret.

Yes, such a CLI tool would help protect you against a MITM with malicious JavaScript.

Re:Firefox Send: Free encrypted file transfer service by Piskvorrr on Tuesday March 12, 2019 @01:23PM (#19370633)
Unlikely but possible. Two words: browser extensions.
Re:Firefox Send: Free encrypted file transfer service by quickthrower2 on Tuesday March 12, 2019 @06:42PM (#19373836)
Three words: My Ether Wallet.