Firefox has a known issue with using the numeral 1 as an access key shortcut, a bug that has been present through several versions of the browser. Essentially Firefox sees the 1 key as being shifted when it is used. As accesskey 1 is usually reserved for the home / index page, the solution is to create an alternate accesskey link to the home page with the exclamation point (i.e. a shifted 1) as the shortcut. This is easy, as the home page is usually linked to at least twice on every page: once in the navigation bar, and once in the <h1> element. An example would be:

<h1><a href="index.html" accesskey="!">Brobdingnagian Corporation</a></h1>
<nav role="navigation">
	<a href="index.html" accesskey="1">Home</a>
	<a href="about.html" accesskey="2">About</a>
	<a href="map.html" accesskey="3">Site Map</a>
	<a href="search.html" accesskey="4">Search</a>
	<a href="help.html" accesskey="0">Help</a>

Firefox will interpret any use of the 1 key as an exclamation point, and use the accesskey attribute in the link around the h1 content; all other browsers will use the normal 1 shortcut provided by the link in the unordered list.

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