Disable 2 step varification when opening yahoo.com on Firefox but not on Microsoft Edge

When using "Firefox" to open my yahoo email account, I must complete a 2 step verification to access my emails. However, on the same computer, if I open my yahoo email account using" Microsoft Edge", I am never asked for a 2 step verification. A phone call with Yahoo tech support stated the problem is with my "Firefox" settings. Please tell me what boxes I need to either check or uncheck in the Firefox settings to fix this annoying problem Thank you.