Are they from Firefox, the website, an add-on? or something else?

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Thank you!

Thanks so much. I am definitely new at this procedure but I did capture a screenshot - below. This is a typical example of the things that get on the screen and make working impossible. I have yet to find a simple way to "click" them away.!!! It's been going on for months! maggie

HI AGAIN! This screenshot should give you a better idea. I was on an Etsy account looking for pottery and up popped the menu "thing" just drifting in the middle but stopping everything! Hope this helps. A million thanks again!!! Maggie

That is a Firefox 'context' menu which should only appear when you right-click an image. Pressing ESC or clicking elsewhere on the page should dismiss it.

Thanks again so much!!! I went to the MOUSE preference and took off the check mark for the RIGHT CLICK - can it be this easy??? The whole thing has been a nightmare!! Will keep you posted!!! m.