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WHY DO I HAVE TO USE MY SMART PHONE TO SIGN INTO MY YAHOO ACCOUNT
why do I need a code sent to my smart phone in order to sign in to my yahoo account
Chosen solution
This is unrelated to Firefox.
You enabled two factor authentication in your Yahoo account settings. See this Yahoo document about the feature https://help.yahoo.com/kb/SLN5013.html
If you need additional help with this you would need to contact Yahoo.
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Chosen Solution
This is unrelated to Firefox.
You enabled two factor authentication in your Yahoo account settings. See this Yahoo document about the feature https://help.yahoo.com/kb/SLN5013.html
If you need additional help with this you would need to contact Yahoo.