Please figure out how fast, because this is not going to go over well with members, especially on FF and MEF, where people are mostly all trained to use the link button.  There are already complaints.  If you can cover full URLs, ok, but converted links should be left alone.

And really, I don't think you could find any problems in FF.  When they happen they don't last for long because I fix them.  It's what you're paying me for.  If you want to apply this "fix" to other forums I can see it, but not there.