There was a duckduckgo extension in Firefox. Turning it off cured the problem. Thanks so much for your help!
It’s DuckDuckGo that’s doing the blocking. Changed it from being my default search engine but that didn’t work. It’s blocking all kinds of stuff in the WordPress admin area.
“DuckDuckGo blocked this content to prevent Facebook from tracking you”
Guess it’s time to ditch the Firefox web browser. It’s blocking stuff on this website too!
