text: let windowId = 0;
  const CONTEXT_MENU_ID = 'example_context_menu';
  
  function closeIfExist() {
    if (windowId > 0) {
      chrome.windows.remove(windowId);
      windowId = chrome.windows.WINDOW_ID_NONE;
    }
  }
  
  function popWindow(type) {
    closeIfExist();
    const options = {
      type: 'popup',
      left: 100,
      top: 100,
      width: 800,
      height: 475,
    };
    if (type === 'open') {
      options.url = 'window.html';
      chrome.windows.create(options, (win) => {
        windowId = win.id;
      });
    }
  }
  
  chrome.contextMenus.create({
    id: CONTEXT_MENU_ID,
    title: 'Sales Tool',
    contexts: ['all'],
    documentUrlPatterns: [
      'https://github.com/*'
    ]
  });
  
  chrome.contextMenus.onClicked.addListener((event) => {
    if (event.menuItemId === CONTEXT_MENU_ID) {
      popWindow('open');
    }
  });
  