How to stop an ebay unwanted banner that scrolls continuously when I do a search to open a new web page

Whenever I use the search function at the top right of the toolbar, I get a banner of ebay that scrolls continuously to the bottom of the screen. Initially, the web page opens okay but is quickly covered by the scrolling banner. I have pop-ups blocked, but this does not prevent the problem. Subject case: config is part of the solution, please guide me through it. I don't know how to access the topic: config

I had it on one of my laptops. There is an add-on called "highlighter browser" or something close to that. I removed that addon and the problem stopped.

Tags: Firefox

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