This seems like a duplicate of Bug 40508.
The difference between IE and Firefox in this bug seems to be that IE breaks words when soft-wrapping doesn't work, not that IE soft-wraps at places Firefox doesn't. So yeah, it's a dup of bug 40508, unless this code is forked between Firefox and Seamonkey.
dupe to bug 40508 or NEW ? otherwise this one will rot ;-)
*** This bug has been marked as a duplicate of 40508 ***
Status: UNCONFIRMED → RESOLVED
Last Resolved: 15 years ago
Resolution: --- → DUPLICATE
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