First, you will need to download the browser extension.
If you don't use browser extensions frequently, you may have to hunt around on your browser a little to find them.
On Firefox:
Look for the three vertical lines at the top right of the page. Click and scroll down to Add-ons and themes.
Once on the Add-Ons Manager, look for the search box labeled "Find more add-ons" and search for LibKey Nomad:
