CODE EXAMPLE FOR JAVASCRIPT

chrome.contextmenus

function getword(info,tab) {
  console.log("Word " + info.selectionText + " was clicked.");
  chrome.tabs.create({  
    url: "http://www.google.com/search?q=" + info.selectionText
  });
}
chrome.contextMenus.create({
  title: "Search: %s", 
  contexts:["selection"], 
  onclick: getword
});