Clear Cache Icon won't appear on toolbar

Hi… my first day here, so I apologize if this is old news, but I couldn’t find anything. So…
I’ve loaded the “Clear Cache” add-on to my new MacBook Pro, but the icon will not appear on the toolbar as I installed it. The “Clear Browsing Data” icon is right there, but not the CC. Any help GREATLY appreciated!

Do you have your browser set to clear all browsing data on every exit? If so, you need to enable the extension to run in private browsing.