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firefox sign up will not accept my email, says "invalid"

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I can't sign up because it always says "email is invalid" even though my email is perfectly valid

I can't sign up because it always says "email is invalid" even though my email is perfectly valid

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Is it possible that your email address was used in the past for any Firefox services or Mozilla websites / sub-domains?

With the slow stage-by-stage conversion over to Firefox Accounts (over a number of years) for multiple different Mozilla domains / services, that email address might already be "spoken for".

If so, that could be why it shows up as "invalid". Has happened to me, a few times.