in chrome at least, start typing "wiki" in the url bar (if it's a common site you go to), hit tab, and then your search term, it'll search and bring you to the

in chrome at least, start typing "wiki" in the url bar (if it's a common site you go to), hit tab, and then your search term, it'll search and bring you to the wikipedia site. This works for most searchable sites you've recently visited, Amazon, youtube, ebay, etc.