Most developers would object to being personally contacted about this sort of thing - reactions would range from your email being deleted without a response to massive flamage.
It would be much better for you to first read the mailing list archive for whatever mozilla mailing list is appropriate for this, to make sure this hasn't already been addressed. For good measure, check the FAQ and other parts of the web site. If that doesn't turn anything up, post to the mailing list. But please don't send private email to the developers - that would defeat the purposes of the mailing list (to scale well and to help the next guy who has the same question).
It looks like they use newsgroups instead of mailing lists:
You also need to check the bug tracking system (Bugzilla) to see if 1) a bug has been reported and 2) where the developers are at in terms of dealing with the bug.
Here is the link for the bug tracking system:
http://www.mozilla.org/bugs/ I just did a quick search, and here is the bug you want:
It appears that they are aware of the bug, it has been assigned, and someone is working on it. There is a duplicate of this bug at:
But you can always double-check the newsgroups to see if it's been talked about lately.