How to get rid of popup window telling me content is not available

[dakota]

I have no idea where this came from but every minute or two I get a popup window which says "This content is no longer available
The content you requested cannot be displayed right now. It may be temporarily unavailable, the link you clicked on may have expired, or you may not have permission to view this page." How do I get rid of it?  I do not remember trying to access anything where this happened.

[Xairbusdriver]

I usually just close the tab/window and try later, if a command R doesn't help. If you have not closed the browser all day and you still get that message, it may help to clear the browser cache. I will leave that task as a valuable learning exercise for the reader.

[jchuzi]

I am a fan of exercise. To clear the Safari cache, limber up your fingers and, after a 5 minute warmup, press Command-Option-E.

[jchuzi]

Two things occurred to me:

1. See if restarting solves the problem.

2. Run MalwareBytes to see if there has been any nefarious software installed.