''locking as a duplicate of https://support.mozilla.org/en-US/questions/1179124'' I like the Autofill feature in Firefox, but FF keeps adding a +1 to my phone number. I enter my phone as 10 digits, no dashes or spaces, area code + number. I change it and the +1 reappears. +1xxx-xxx-xxxx is not a format accepted by most web forms.