Hi,
Unfortunately this bug still appears when using BR instead of DIV for line breaks.
Please see this movie:
http://screencast.com/t/NDYyOGViNTk
Movie was using your example page at:
http://cutesoft.net/example/oncarriagereturn.aspx
This was taken in FF on OSX. Same exists in FF on WIN.
Please fix bug when using BR.
Thanks,
Marcus