What is the bar that appears at the top of pages and how do I get rid of it?

Whenever a page is showing on the screen, a bar appears at the top of the page with a lot of squares ending with a square that says "diagnose." It sometimes causes a printing problem when the document prints out so small that you can't read it.

It sounds like some kind of advertising. Often behaviors that affect multiple sites are caused by an add-on, particularly an extension. You may want to review your extensions on the following page and disable ALL nonessential extensions.
orange Firefox button ''or'' classic Tools menu > Add-ons > Extensions category
After restarting Firefox, is the bar gone?

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