Tor Browser: add DuckDuckGo hidden service into default search engines list
Since DuckDuckGo main website is already in the default install, why not add an engine which searches on the hidden service (http://3g2upl4pq6kufc4m.onion/) as well?
Now I have to add it to bookmarks and assign a keyword to it and it always displays the HTML 5 canvas warning (there is no such warning with Tor Browser's normal DDG engine). I don't know any other way to add it (I guess it would be some customization of about:config)
Adding the hidden service to default search engines would be a great usability improvement.