Shortcut doesn't seem working Rated 5 out of 5 stars

Hi, F8 is supposed to toggle highlighting but I find it doesn't work on:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b1pre) Gecko Minefield/3.1b1pre - Build ID: 20080831170021

This review is for a previous version of the add-on (2.2).