• Open a window in Chrome and load GMail in it
  • Press Ctrl+Shift+J (or Cmd+Opt+J on a Mac) to open Chrome’s JavaScript console

  • Paste this code into the JS console

    navigator.registerProtocolHandler(“mailto”,”https://mail.google.com/mail/?extsrc=mailto&url=%s”,”Gmail”);

  • It will tell you “undefined”.
  • Open a new window in Chrome and open your Gmail in it.
  • Look in the address bar, at the right edge. There will be a double diamond. Click it.
  • Chrome will ask you if you really want Gmail to handle your email. Tell it ‘yes.’