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What are the 3 grey boxes at the top right of the Firefox window

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Keith Straw
Keith Straw

I get three grey boxes at the top right of the Firefox start-up page. See the attached image. They dissappear if I search and enter another web page. The only way I can get rid of them is to reset Firefox. They return within 24 hours.

What are they and how can I get rid of them?

I get three grey boxes at the top right of the Firefox start-up page. See the attached image. They dissappear if I search and enter another web page. The only way I can get rid of them is to reset Firefox. They return within 24 hours. What are they and how can I get rid of them?
Attached screenshots

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