Multi-select field won't work in firefox

I have seen some problems with Z-index and some themes with Admin Menu dropdown. However, with my work on Ubercart (which contains a handful of multiselect boxes) and Firefox I have never encountered any issue with multiselect boxes. Can you recreate the error? If so, what modules/themes are you using and which form do you encounter this issue on?

The cause for this Firefox bug is position: fixed. This has been reported and discussed in admin_menu's queue several times.

I was aware of issues with position:fixed in Firefox, but where does this show itself in multiselect boxes? Does it show when the menu is displayed? hidden? More information on this issue would be helpful.

I don't know either, if this bug in Firefox can also be triggered when a fixed positioned element isn't displayed at all. However, it seems so, since pictogram is reporting exactly the same bug like everyone else: It's impossible to select items in multi-select fields in Firefox.

I know that you don't like that. ;) Have you already considered to implement a JavaScript that continuously resets the (absolute) position of admin_menu upon scrolling? I've seen some impressive jQuery work in the wild some time ago (unfortunately can't remember where).

I've recently tested out Firefox Beta 3 with Admin Menu Dropdown and it appears all previous issues with position: fixed are non existent. If you can confirm multi-select fields work on Firefox Beta 3, this would help determine if this issue stems from Firefox 2's rendering of position: fixed HTML elements.