If you have a Google Chrome browser, you can delete thumbnail images from the web page by using the following steps:

  1. Open Google Chrome.
  2. Type “chrome://flags/#delete-thumbnail” into the address bar and hit enter.
  3. A list of flags will appear, including “disableThumbnailCache”: false. You can change this to true by clicking on the checkbox next to it.
  4. Click on “delete thumbnail.”