User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060129 Firefox/1.6a1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060129 Firefox/1.6a1 If you click any firefox menu (for example, Tools) and attempt to move your mouse cursor up & down the menu without releasing the mouse button, you don't see any of the highlights on the menus. If you click the menu, then release the mouse button, you do see the highlighted items change as you move your mouse. I've captured a flash movie demonstrating the problem here: http://chris.polymathic.net/chris/ff/ff.html Reproducible: Always Steps to Reproduce: See above

*** This bug has been marked as a duplicate of 324963 ***