This page details how to setup the ability to search Wikipedia from within your Web browser's search box. These browsers support the OpenSearch standard. Some browsers support the Wikipedia search engine plugin by default.
To get Wikipedia search results while on any web page, you can temporarily set your browser's (web-based) search box to interface the Wikipedia search engine and land on Wikipedia's search results page. This trick removes the need to first navigate to Wikipedia from a web page, and then do the search or navigation. It is a temporary change, and then you put it back to your preferred web-search engine.
Say while on some web page, you decide to research, at Wikipedia, material on that web page. You change your web-search box to "Wikipedia (en)", and enter the page name or the query while on that web page. The other example is that you decide to contribute information from the web to Wikipedia. Furthermore, you can reach all twelve sister projects the same way. For example, you can go straight to a Wiktionary entry by using the prefix wikt: from your web-search box.