On various pages (eg. secure/admin/ViewIssueTypes.jspa), as soon as the page loads, the cursor focus jumps to the first input field. It is done with this Javascript snippet:

    <script language="javascript" type="text/javascript">
	    try { document.jiraform.elements[0].focus(); } catch (e) {}
	</script>

This is darn annoying, as 90% of the time I want to use Firefox '/' to search for text in the page, and find myself instead typing into a text field.