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On the Toolbar there is an "Options" button usually next to the "AutoFill" & "toggle highlighting."
Click on options and you will see the "Toolbar Options" window popup. There are 3 tabs at the top of this window, you want the one that says "more."
Look for Category "Web buttons" on the list, the third one down says "category" with a green book icon. Check the box next to it, click "apply" and "Ok" then refresh your browser window!
You should be good to go!
if you want to know if a site is in the google directory then try alexa - there is usually the GD category and description - (DMOZ)
you have to type domainname.com into the search box to get the reviews, rating, and stats. there is also the Dmoz, GD category.