Firefox 3.6 introduces line feeds inside attribute when copy and past element within content editable div

Firefox 3.6 introduces line feeds inside attribute when copy and past element within content editable div

OwaTest1

FF3.6 Repro: select OwaTest1 and paste into content editable DIV above
This is a regression that does not repro in FF3.5.7

Original span with no extra linefeeds within attribute '_em'

Copied span with extra linefeeds in attribute '_em' that breaks Outlook Web App