Comment 15 for bug 42795

while i cannot deny that this might have been caused by some ubuntu/debian specifics in 1.5, iceweasel has never been released from 1.5. So the observation that firefox 2.0 in edgy fixes is not at adds with your observation that iceweasel has never had this issue.

For dapper, I am not sure ... need a detailed working testcase or some tester who can help to sort this out on irc: on freenode -> #ubuntu-mozillateam.