Good luck, a lot of people have noticed problems with a touchpad and Firefox. I am pretty sure it is a bug. I gave up and just use a mouse.
If you search the Firefox forum at http://forums.mozillazine.org/index.php
you will notice a couple of long threads. Although most of them involved people using windows.
There a couple of ways you can try to tackel the problem. Try looking for one of the following packages. (Sorry I know nothing about Fedora other than it is based on RH).
Either ksynaptics or qtsynaptics should help you configure the touchpad. Or you can manually edit the xfree86 config file.
Hope some of this helped.