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why do I have to use a code, sent to my email address, to sign in to Firefox? Why can't I have a code sent to my phone number?

why do I have to use a code, sent to my email address, to sign in to Firefox? Why can't I have a code sent to my phone number?

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Hi DMACG, after you verify your email account, you can have a code sent to an authentication app, but I don't know whether you can use SMS.

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P.S. Using a Firefox Account is optional and provides access to services such as Sync. You don't need to connect to or sign in to a Firefox Account to browse the web.