More precise warning message for iframe type
More precise warning message for iframe type

wagnerand/amo-validator,mozilla/amo-validator,diox/amo-validator,mozilla/amo-validator,mstriemer/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,mstriemer/amo-validator,mozilla/amo-validator,mstriemer/amo-validator,wagnerand/amo-validator,diox/amo-validator,diox/amo-validator,diox/amo-validator,mstriemer/amo-validator