The color picker (under Template Display Preferences) does not work for Mozilla 1.4 (but it does for IE).
It seems to be a Javascript issue, although there is code to detect capabilities it doesn't seem to be working quite right. The immediate problem is that the test for getElementByID passes which sets use_gebi to true, but offsetLeft is not a Mozilla property.
Files involved:
calendarscript/templates/admin/English/AnchorPosition.js
calendarscript/templates/admin/English/PopupWindow.js
Tested at two locations. Here's the id string of one of them: "Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4) Gecko/20030624".
Martin Flack
NeoReality