Small bookmarklet to help change app drawer icons for Chrome OS web apps

README.md

• Create a bookmark with the following text in the URL field:

javascript:(function() {
  if (!document.querySelectorAll('link[rel*=icon]').length) {
      const link = document.createElement('link');
      link.rel   = 'icon';
      document.querySelector('head').appendChild(link);
  }

  const links = document.querySelectorAll('link[rel*=icon]');
  const href  = prompt('Enter your new shelf icon\'s URL');
  href && links.forEach((link) => link.href = href);
})();

• Click the bookmark on your desired page
• Enter the desired shelf icon URL and click OK.
• Add the page to your shelf.

Thanks to /u/dimethylarginine for discovering this trick.