text: chrome.contextMenus.create({
      id: "explain-search",
      title: "See on ExplainShell",
      contexts: ["selection"]
  });
  
  browser.contextMenus.onClicked.addListener(function(info, tab) {
      if(info.menuItemId == "explain-search") {
          searchJisho(info.selectionText);
      }
  });
  
  function searchJisho(data) {
      browser.tabs.create({url:'http://www.explainshell.com/explain?cmd='+data});
  }
  