How to install the browser extension to view Organic Chemistry animation

This is hopefully a temporary / interim fix for one-off installations. (Write to me to be informed on progress).  

In Microsoft Edge 

• Search at Microsoft Edge Extensions for 'ruffle'. Click Get to install the extension.
• You can see the installed extension at edge://extensions/

In Chrome (see picture and video below)

• Click the latest "Chrome / Edge / Safari" link at ruffle. Keep a keen eye to see which folder the zip file goes into. Extract the zip file.
  Copy paste or type in the address bar: chrome://extensions/
  Turn on Developer mode in the top right corner.
• Click Load unpacked. Select the folder you extracted the extension to.
• Scroll down this page to see an animation

In Firefox

Right-click the latest Firefox .xpi download link at Ruffle Click "Save Link As..."
Navigate to about:debugging Click on This Firefox.
Click Load Temporary Add-on... Select the .xpi that you downloaded.

Watch video on Youtube or play below