Fonts Change When Composing Emails In Thunderbird 3.0b2

[Christopher Beland]

I recommend filing a report at bugzilla.redhat.com against thunderbird.
It might be worthwhile to experiment to see if the specific text that
you type influences whether or not the bug is encountered.  (It seems
like it may be a usability problem, if nothing else.)  It would also be
worth noting if this started happening only recently.

-B.